Last Updated: March 2026
What Evidence Can Be Gathered in an Infidelity Investigation?
An infidelity investigation in British Columbia can produce several types of evidence depending on the methods used and the circumstances of the case: surveillance reports with photographs and video, digital forensic findings from authorized device examinations, polygraph examination results, background check findings, and open-source intelligence reports. What the client ultimately receives is a professionally documented package of factual findings that can be used for personal decision-making, separation planning, or, where appropriate, family law proceedings.
This page explains what each type of evidence actually looks like as a deliverable, how the different types of evidence work together, and what determines whether the evidence will be useful for the client’s specific situation.
This guide is published by Shadow Investigations Ltd., a licensed private investigation firm based in Vancouver, BC, serving British Columbia since 1990.
On This Page
- What Does a Surveillance Report Include?
- What Does Photographic and Video Evidence Look Like?
- What Evidence Does GPS Tracking Produce?
- What Evidence Can Be Recovered Through Digital Forensics?
- What Does a Polygraph Examination Report Include?
- What Evidence Do Background Checks and OSINT Produce?
- What Does Audio Recording Evidence Look Like?
- How Do Different Types of Evidence Work Together?
- Can Infidelity Evidence Be Used in Family Law Proceedings in BC?
- What If the Investigation Does Not Produce Clear Evidence?
- What Is the Difference Between Evidence for Personal Clarity and Evidence for Court?
What Does a Surveillance Report Include?
A surveillance report is the primary deliverable in most infidelity investigations. It is a written document prepared by the investigation company that provides a factual, chronological account of everything observed during each surveillance period. A professionally prepared surveillance report is not a casual summary; it is a structured document designed to be clear, objective, and useful whether the client needs it for personal clarity or as supporting material in a legal proceeding.
A typical surveillance report includes:
- Date, time, and location details: The report documents when the surveillance period began and ended, where the investigator was positioned, and the locations the subject visited. Each significant observation is timestamped so the client can follow the subject’s movements in sequence.
- Detailed narrative of observations: The investigator describes what was observed in plain, factual language. This includes the subject’s departure from a location, arrivals at other destinations, who they met (described by appearance if not yet identified), activities seen, how long they stayed, and their departure. The narrative avoids assumptions and reports only what was directly observed.
- Vehicle information: The report typically notes the subject’s vehicle description, plate number, and any other vehicles relevant to the observations, such as a vehicle observed at a location the subject visited.
- References to supporting photographs and video: The report references photographs (extracted from video recordings) that correspond to key observations, so the client or legal counsel can match the written account to the visual evidence.
- Weather and visibility conditions: These are documented because they affect what the investigator could observe and the quality of photographic evidence.
The report is written in a neutral, professional tone. It does not include opinions about what the subject’s behaviour means, speculation about relationships, or conclusions about guilt or innocence. Its purpose is to present the facts clearly so the client, or their lawyer, can draw their own conclusions.
What Does Photographic and Video Evidence Look Like?
Photographic and video evidence from a surveillance period is organized to support the written report. Rather than receiving a random collection of images, the client receives visual evidence that has been reviewed, selected for relevance, and tied to specific observations in the report.
All evidence is captured as video footage. Photographs are extracted directly from that footage rather than taken as separate images, which means every photograph is drawn from a verified, timestamped recording.
What Gets Documented?
Surveillance footage typically captures:
- The subject’s vehicle at key locations
- The subject arriving at or departing from locations
- Relevant addresses or businesses visited
- The subject in the company of other individuals
- Observable behaviours or interactions
Video Evidence
Video is often more compelling than still images alone because it captures movement, duration, and context. A photograph serves as a useful visual reference within a report, but the video from which it is extracted tells a fuller story, capturing the subject arriving, greeting someone, entering a location together, and the duration of the interaction. When the client’s concern centres on a specific meeting or encounter, video provides context that a still image alone cannot.
How It Is the Evidence Delivered?
Rather than hours of raw footage, the client receives:
- Organized video clips identifying segments that document relevant activity
- Photographs extracted directly from those clips
- All footage presented in chronological order, timestamped and tied to the investigators’ written observations in the report
The overall quality of the evidence depends on factors such as distance, lighting, weather, and the investigator’s vantage point.
What Evidence Does GPS Tracking Produce?
When a tracking device has been deployed on a vehicle the client owns, it produces a log of the vehicle’s movements over the monitoring period. This data typically includes:
- A record of every location the vehicle visited, with addresses or map coordinates
- Arrival and departure times at each location
- The duration of each stop
- Routes traveled between locations
- Patterns over multiple days, such as recurring visits to the same address
GPS data can be useful when it fills gaps that surveillance alone may miss. Surveillance covers specific planned windows of time, whereas a tracking device runs continuously, capable of documenting an unexpected stop late at night, a visit to an unfamiliar address mid-afternoon, or a pattern of returning to the same location multiple times a week.
However, there are limitations to what GPS data can establish on its own without surveillance to give them meaningful context and evidentiary value:
- It confirms that a vehicle was at a location, but not who was driving or who was present
- It cannot identify other individuals involved or document interactions
- It produces no photographic or video evidence
- It cannot capture what took place at a location or for what purpose the visit occurred
- It does not provide the kind of documented observations that carry weight in a legal proceeding
What Evidence Can Be Recovered Through Digital Forensics?
When a digital forensic examination is authorized, the resulting evidence can include a wide range of data recovered from the device.
Types of evidence that a forensic examination may produce include:
- Text messages and chat conversations: Recovered from native messaging apps as well as third-party platforms such as WhatsApp, Signal, Telegram, Facebook Messenger, and others. This may include messages the subject deleted
- Call logs: Incoming, outgoing, and missed calls with timestamps, durations, and contact information, including deleted entries that may no longer be visible on the device
- Photographs and videos: Including images that were deleted from the visible gallery but remain recoverable in the device’s storage. Photo metadata often includes the date, time, and GPS coordinates where the image was taken
- Location history: GPS data from mapping applications, geotagged photographs, and device-level location services can reveal where the device was at specific times
- App installation and usage history: Which apps were installed, when they were used, how frequently, and in some cases when they were removed; this can be significant if the subject installed and then deleted a dating app or an encrypted messaging platform
- Browsing history and search queries: Visited websites, web searches, and bookmarks, including content the subject may have cleared from the browser
- Email content: Locally stored emails relevant to the investigation
- Account information: Records of accounts active on the device at the time of examination
- Downloaded files: Documents, images, or other files retrieved through the browser or applications, with associated timestamps and sources
How Is Digital Forensic Evidence Presented?
A forensic report is not a raw data dump. The examiner organizes the recovered data, identifies what is relevant to the investigation, and presents the findings in a structured report. Key components typically include:
- Case identification and chain of custody: Documenting the device examined, the date it was received, and maintaining a clear record from receipt through return
- Examiner credentials and tools used: The examiner’s certifications and the forensic software used for extraction, including version numbers and timestamps, which are important for court admissibility
- Extraction methodology: How data was pulled from the device, the connection method used, and the technical details that establish the forensic soundness of the acquisition
- Recovered data and findings: Organized and presented with examiner commentary contextualizing what was found and what it indicates
- Conclusions: A clear summary of the findings and their significance to the investigation
The documentation of process is as important as the findings themselves. Establishing that data was recovered through a reliable, reproducible method and has not been altered is what gives the evidence weight if the matter proceeds to legal proceedings.
Not all data is recoverable in every case. Devices that have been factory reset, encrypted, or physically damaged may yield limited results, and it is worth noting that an unusually high number of factory reset events on a device can itself be a significant finding. A forensic examiner can typically assess the likely scope of recovery before committing to a full examination, so the client has a realistic sense of what to expect.
What Does a Polygraph Examination Report Include?
A polygraph examination produces a report from the examiner that documents the process and results. The report typically includes:
- The specific questions that were asked during the examination
- The subject’s answers to each question
- The examiner’s assessment of whether the physiological responses indicated truthfulness or deception
- A summary of the pre-test suitability assessment and the post-test evaluation
- The examiner’s professional opinion on the overall results
Polygraph evidence is different from other types of evidence in an infidelity investigation because it addresses truthfulness directly rather than documenting behaviour. The examiner’s report states whether, in their professional opinion, the subject’s responses were consistent with truthfulness or consistent with deception on the specific questions asked.
Because polygraph results are generally not admissible in court in Canada, this evidence is most useful for personal decision-making. Clients use polygraph results to decide whether to trust a partner’s account, whether to proceed with separation, whether to pursue counselling, or whether further investigation is warranted. The value is in the clarity it provides, even though the result does not carry legal weight.
What Evidence Do Background Checks and OSINT Produce?
Background checks and open-source intelligence produce supporting evidence that adds context to the primary findings from surveillance, digital forensics, or other methods.
Background Check Findings
A background check report may include:
- Identity verification for a suspected third party
- Address history that may connect individuals or explain patterns observed during surveillance
- Business associations or corporate records that clarify relationships
- Vehicle registration information that helps identify the owner of a vehicle observed during surveillance
- Public records that confirm or contradict claims the subject has made
Background check findings are typically presented as a summary report that identifies what was found, what sources were used, and how the findings relate to the broader investigation. On their own, background check results may not prove infidelity. Their value is in connecting dots, identifying who lives at the address the subject keeps visiting or confirming that the person the subject was photographed with has a connection that contradicts the subject’s explanation.
OSINT Findings
OSINT evidence consists of publicly available online information that has been identified, documented, and preserved. This may include:
- Public social media posts, check-ins, or tagged photographs with timestamps
- Public profile information that identifies a suspected third party or confirms associations
- Publicly visible interactions between the subject and another individual
- Timeline evidence, such as a public post showing the subject at a particular location on a particular date, that corroborates or contradicts other findings
OSINT evidence is documented with screenshots, URLs, and timestamps at the time of collection. This is important because online content can be deleted or changed. Capturing and preserving it at the time of the investigation ensures it remains available even if the subject later removes it.
What Does Audio Recording Evidence Look Like?
When a client records a conversation they are personally participating in, which is permitted under Canada’s one-party consent rule, the recording itself becomes a piece of evidence. This is typically an audio file that captures the full conversation, including any admissions, denials, inconsistencies, or commitments made by the subject.
Audio recording evidence is most useful when:
- The subject makes a specific admission or denial that the client wants preserved accurately rather than relying on their own memory of the conversation
- The subject’s statements contradict what they have told others, what they have told the client previously, or what was observed during surveillance
- The recording documents a commitment or agreement that may become relevant in a separation or family law context
The evidentiary value of a recording depends on its clarity, completeness, and the circumstances under which it was made. A recording that captures a clear, unambiguous statement in a natural conversation is more useful than a recording where the client is leading the subject toward a particular answer. If the recording may be used in legal proceedings, it is advisable to preserve the original file without editing and to consult legal counsel about how to present it.
How Do Different Types of Evidence Work Together?
Infidelity investigations often provide the most complete picture when multiple methods are used. While many cases are resolved through surveillance alone, combining methods can uncover details that direct observation alone may not capture.
Here an example of how the pieces could fit together:
Surveillance documents the behaviour. The investigator observes the subject arriving at an unfamiliar address at 8 p.m. on a Friday, remaining for four hours, and departing at midnight. Photographs and video document the arrival, the location, and the departure.
GPS tracking confirms the pattern. The tracking log shows the subject has visited the same address on three consecutive Fridays, each time between approximately 8 p.m. and midnight. This establishes a recurring pattern that a single surveillance period alone would not reveal.
A background check identifies the location. Research of the address identifies the owner by name, confirms their connection to the subject through professional or social associations, and rules out innocent explanations the subject may have offered.
OSINT provides supporting context. Public social media posts show the subject and the identified individual interacting online, attending the same events, or tagged in the same locations on dates that align with the surveillance or GPS data.
Digital forensics reveals the communication. If the client authorizes a forensic examination of a device they own, recovered messages may show direct communication between the subject and the identified individual that confirms the nature of the relationship.
A polygraph addresses the denial. If the subject maintains there is no relationship and agrees to a polygraph, the examination results provide an additional data point on whether their account is truthful.
When one investigative method alone does not provide enough evidence, combining approaches can produce stronger, more reliable findings, whether for personal clarity or for use in a legal proceeding.
Can Infidelity Evidence Be Used in Family Law Proceedings in BC?
Evidence from a professional infidelity investigation can be relevant in family law proceedings in British Columbia, though its role depends on the specific issues in dispute. Canada has a no-fault divorce system, which means a court does not require proof of infidelity to grant a divorce. However, infidelity evidence can become relevant in several related areas:
- Spousal support: While infidelity alone does not typically determine spousal support entitlement, evidence of a hidden relationship may be relevant if it affects the financial picture, for example if the subject is supporting another person, concealing income, or misrepresenting their living situation.
- Property division: Evidence that a spouse has been diverting marital assets, spending significantly on another relationship, or concealing financial activity may be relevant to equitable property division.
- Credibility: If the subject has made sworn statements or representations that are contradicted by surveillance evidence, digital forensic findings, or other documented facts, the evidence can be used to challenge their credibility on any issue before the court.
- Parenting and custody: In some cases, the subject’s conduct, such as exposing children to inappropriate situations, neglecting parental responsibilities while pursuing another relationship, or introducing a new partner in a way that affects the children, may be relevant to parenting arrangements.
For evidence to be useful in a legal proceeding, it must have been gathered through lawful methods. This is one of the core reasons to retain a licensed private investigator rather than investigating on your own. Professionally gathered and documented evidence is more likely to be accepted by the court and more difficult for the opposing party to challenge.
If you are considering using investigation findings in a family law matter, speaking with a family law lawyer early in the process is strongly recommended, as a lawyer can help you understand how the evidence may apply to your specific circumstances and how best to present it.
What If the Investigation Does Not Produce Clear Evidence?
Not every infidelity investigation produces dramatic findings. In some cases, the surveillance period documents routine behaviour with nothing suspicious observed. The subject went to work, came home, and did not meet anyone or visit any unexpected locations. This is a legitimate and documented result, not a failure.
An investigation that does not produce evidence of infidelity can still be valuable in several ways:
- It may provide reassurance that the client’s concerns were unfounded, allowing them to move forward with greater confidence
- It may indicate that the time window investigated was not the right one, and that a different period or approach should be considered
- It may rule out certain locations, individuals, or patterns, which narrows the focus for any subsequent investigative work
- It creates a documented baseline, so if the client later needs to investigate again, the earlier findings provide context
The absence of activity during one surveillance period can be as informative as what is captured in another. If the subject’s behaviour appears to change on specific days or under specific circumstances, that pattern itself can help focus follow-up surveillance on the most productive windows.
An experienced investigator will discuss the results honestly with the client and recommend whether further investigation is warranted or whether the available evidence, positive or negative, already provides the clarity the client needs.
What Is the Difference Between Evidence for Personal Clarity and Evidence for Court?
Many infidelity investigations are conducted for personal reasons rather than in anticipation of legal proceedings. The client wants to know the truth so they can make decisions about their own life. In those cases, the standard for useful evidence is practical: does it answer the client’s question clearly enough for them to act on it?
When evidence may be needed for court, the standard is higher. Evidence that may be presented in a family law proceeding should be:
- Gathered through lawful methods that the investigator can explain and defend
- Documented with clear timestamps, locations, and factual descriptions
- Supported by the investigator’s notes, photographs, and video where available
- Organized in a professional report that can be reviewed by legal counsel
- Maintained with an unbroken chain of custody for digital evidence
The good news is that a properly conducted investigation meets both standards. Evidence gathered professionally and documented thoroughly is useful whether the client ultimately needs it for personal peace of mind or for a courtroom. That is one of the advantages of retaining a licensed investigator from the start, as the evidence is gathered to a professional standard regardless of where the matter ultimately goes, so the client does not have to re-investigate later if the situation escalates.
Frequently Asked Questions
You will receive a written surveillance report with a chronological account of observations, supported by photographs and video where available. Depending on the methods used, you may also receive a digital forensic report, a polygraph examiner’s report, background check findings, and documented OSINT results. The deliverables are organized into a clear evidence package.
Yes. Courts generally admit evidence collected by a licensed private investigator, so long as it was obtained from a lawful vantage point and satisfies relevance and other evidentiary requirements. The investigator may be required to swear an affidavit attesting to the investigation report or give testimony explaining how the evidence was gathered.
In many cases, yes. A digital forensic examination can recover deleted messages, call logs, photographs, and other data from a phone or computer. Recovery depends on the device type, how recently the data was deleted, and whether the device has been reset or encrypted. Authorization from the device owner or a court order is required.
A professional investigator takes precautions to conduct surveillance discreetly. However, no investigation can guarantee that the subject will never become aware. If a subject becomes alert or surveillance-aware, the investigator may recommend pausing and reassessing the approach. Evidence gathered before that point remains valid and documented.
Yes. A licensed private investigator can be called as a witness to testify about their observations, the methods used, and the evidence gathered. Their testimony is treated as that of a professional witness, and the written report and supporting evidence provide the foundation for that testimony.
A result that does not confirm infidelity is still a documented result. Many clients find significant value in knowing that their concerns were investigated professionally and that nothing suspicious was found. The report documents what was observed, which can provide reassurance or help the client decide whether further investigation is warranted.
Related Knowledge Pages
- Infidelity Investigations in BC — Main Page
- What Methods Are Used in Infidelity Investigations?
- How Much Does an Infidelity Investigation Cost in BC?
- What Are the Legal Considerations for Infidelity Investigations in BC?
- Infidelity Investigations in BC — Frequently Asked Questions
Related Articles
- How Surveillance Investigators Obtain Evidence Undetected
- Post-Infidelity Considerations After Catching a Spouse Cheating
Want to Know What Evidence May Be Available in Your Situation?
If you are considering an infidelity investigation and want to understand what kind of evidence may be obtainable in your specific circumstances, contact Shadow Investigations by phone at 604-657-4499 or through our confidential inquiry form below. We can assess your situation during a free consultation, explain what deliverables to expect, and recommend the approach most likely to produce useful results.
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