Every investigation eventually comes down to a single question: can you prove it? A photograph, a hard drive, a surveillance video, or a signed statement is only as valuable as the record showing where it came from and who touched it along the way. That record is the chain of custody, and it is the unbroken link that connects what an investigator found in the field to what a judge, jury, insurer, or employer is willing to believe.
For private investigators, attorneys, HR departments, and business owners who hire them, understanding how custody works is not an academic exercise. A single undocumented handoff can turn strong evidence into an argument about whether it was tampered with. This article explains what a proper custody record looks like, why it matters in Massachusetts courts and beyond, and how Hub protects evidence from the moment it is collected.
What Is Chain of Custody?
The National Institute of Standards and Technology describes chain of custody as a process that tracks evidence through its collection, safeguarding, and analysis by documenting each person who handled it, when it was collected or transferred, and why the transfer happened. That definition, found in the NIST Computer Security Resource Center glossary, captures the three questions every custody log must answer:
- Who had the item at every moment?
- When did it change hands, and when was it collected?
- Why was it moved, and what was done to it?
If any of those questions cannot be answered for any period of time, there is a gap in the chain of custody. Gaps do not automatically make evidence worthless, but they invite the other side to argue that the item could have been altered, swapped, or contaminated.
Why the Record Matters in Court
Evidence does not walk into a courtroom on its own. The party offering it has to authenticate it. Under Federal Rule of Evidence 901, the proponent must produce evidence sufficient to support a finding that the item is what the proponent claims it is. Massachusetts follows a similar approach, set out in Section 901 of the Massachusetts Guide to Evidence published by the Supreme Judicial Court.
For some items, authentication is easy. A witness recognizes a signed contract or a distinctive object. For fungible or easily altered items, such as a digital file, a small physical object, or a biological sample, the chain of custody becomes the backbone of authentication. It is how the investigator shows that the video played in court is the same video pulled from the camera system, with nothing added or removed.
The chain of custody matters outside the courtroom, too. Insurance carriers reviewing a claim, employers deciding whether to discipline or terminate an employee, and corporate boards evaluating an internal investigation all rely on evidence they can trust. A clean record lets decision-makers focus on what the evidence shows rather than whether it can be believed.
The Core Elements of a Proper Custody Log
A defensible custody record is simple in concept and demanding in practice. At a minimum, it should include:
- A unique identifier for each item, such as an evidence number, that follows it everywhere.
- A description of the item detailed enough to distinguish it from similar items, including serial numbers, file names, or physical characteristics.
- Collection details: date, time, location, the name of the person who collected it, and the method used.
- Every transfer, recorded with the name and signature of the person releasing it, the person receiving it, the date and time, and the purpose.
- Storage conditions, including where the item was kept and who had access to that location.
- Any examination or testing, noting who performed it and what was done.
- Final disposition, whether the item was returned, retained, or destroyed, and on whose authority.
Physical evidence should be sealed in tamper-evident packaging, with the collector’s initials and the date written across the seal. Any time the seal is broken for examination, that fact belongs in the log, and the item should be resealed and re-initialed.
Chain of Custody for Digital Evidence
Much of today’s investigative work involves data rather than objects: phone extractions, social media captures, emails, GPS records, and security camera footage. Digital evidence is powerful because it is detailed, and fragile because it is easy to change without leaving a visible mark. Simply opening a file can alter its metadata.
Investigators address that fragility with a few established practices, many of which are described in NIST Special Publication 800-86, the agency’s guide to integrating forensic techniques into incident response:
- Work from copies. A forensic image or verified copy is made, and the original is preserved untouched.
- Use hash values. A cryptographic hash acts as a digital fingerprint. If the hash of the copy matches the hash of the original, the copy is identical. If even a single bit changes, the hash changes.
- Document tools and settings. Recording which software and hardware were used, and how, lets another examiner reproduce the work.
- Capture context. For web and social media evidence, capturing the URL, date, time, and surrounding page content helps establish that a post existed as shown.
Surveillance footage deserves special mention. Many business camera systems overwrite recordings after a set number of days. The first step in preserving video evidence is often simply exporting it before it disappears, then documenting the export with the system’s time settings, the camera location, and a hash of the exported file. A CCTV and surveillance assessment can identify whether a system’s retention settings and export functions will actually support an investigation when you need them.
Common Ways the Chain Breaks
Most chain of custody failures are not dramatic. They are small lapses that seemed harmless at the time:
- An item is left on a desk overnight instead of in locked storage.
- A manager forwards a video clip by text message instead of preserving the original file.
- Two similar items are collected without distinct labels.
- A transfer happens verbally, with no signature or time recorded.
- An employee “helpfully” reviews a phone or computer before the investigator arrives.
- Screenshots are taken without the date, time, or source URL.
Each of these gives opposing counsel a question to ask on cross-examination. Individually they may not sink a case, but together they can make a strong case look careless.
What Businesses Should Do Before the Investigator Arrives
Many investigations begin inside a company: suspected employee theft, a workplace injury claim that does not add up, a harassment complaint, or a data leak. The first hours often decide whether the evidence survives and whether a clean chain of custody can be established. If you suspect a problem:
- Limit access. Keep the number of people who touch relevant items or devices as small as possible.
- Do not investigate devices yourself. Powering on, browsing, or “just checking” a computer or phone can change the data.
- Preserve video immediately. Check your camera system’s retention period and export relevant footage before it is overwritten.
- Write down what you know. Note who discovered the issue, when, and what they did.
- Call a licensed investigator early. The sooner a professional takes custody, the shorter the undocumented window.
How Hub Maintains the Chain of Custody
Hub Security and Investigative Group is a Massachusetts licensed private detective firm, and custody discipline is built into how our investigators work. Our senior staff bring decades of combined law enforcement and loss prevention experience, which means they have seen firsthand how evidence is challenged and what it takes to withstand that challenge.
On every engagement, we document collection and transfers in writing, use tamper-evident packaging for physical items, preserve digital evidence with verified copies and hash values, and store evidence securely with restricted access. Our reports are written so an attorney, adjuster, or HR director can follow exactly how each item was obtained and handled. That discipline applies across our work, from surveillance investigations and corporate investigations to insurance fraud investigations, where a claimant’s attorney will scrutinize every video clip and photograph.
Custody in Security Operations, Not Just Investigations
Maintaining a chain of custody is not only a job for detectives. Security officers routinely encounter evidence: a found weapon, a shoplifted item recovered at the door, a lost wallet, or video of an assault in a parking garage. How an officer handles that item in the first minutes can determine whether police and prosecutors can use it later. That is why evidence handling, note-taking, and report writing belong in every officer’s training, and why Hub officers are trained to secure an item, document it, and hand it to responding police with a clear record rather than a vague recollection.
Chain of Custody Across Greater Boston
Hub supports attorneys, insurers, and businesses throughout the region. We handle matters for clients in Boston law firms and corporate offices, research and technology companies in Cambridge, employers in Lowell and the Merrimack Valley, and property owners in Newton and the western suburbs. Wherever the work takes place, the standard is the same: every item accounted for, every handoff documented.
The Bottom Line
Good evidence can be undone by a poor record, and modest evidence can carry real weight when its history is airtight. Treating the chain of custody as a routine, non-negotiable part of the job protects the investigation, the client, and the people whose rights depend on the truth coming out.
If you are facing an internal matter, preparing for litigation, or need evidence collected and preserved properly, contact Hub for a confidential consultation. Call our 24/7 dispatch at (617) 857-1200 or send us a message. Hub is licensed by the Massachusetts State Police under license LP0203L.
By Derek Kreymer, Operations Manager