Physical evidence is only as strong as the paper trail behind it. A perfectly collected DNA swab or a fired cartridge case can lose much of its value if no one can show where it has been, who handled it and whether anything happened to it along the way. That paper trail is the chain of custody, and gaps in it are one of the most common reasons evidence gets challenged in court.
Robert Walker, a crime scene investigator with Speckin Forensics, spent twenty years collecting, packaging and documenting evidence for the Lee County Sheriff’s Office and years more teaching other investigators how to do it. This article explains what that record is, how it breaks down, and what a breakdown actually means for a case.
What Is Chain of Custody?
Chain of custody is the documented, unbroken history of an item of evidence from the moment it is collected until it is presented in court or disposed of. It records who collected the item, when and where it was collected, how it was packaged and sealed, every person who took possession of it afterward, why they had it, and how it was stored. The purpose is simple: to show that the item offered in court is the same item recovered from the scene, and that it has not been altered, contaminated or swapped.
In practice the chain starts with the crime scene investigator. The item is photographed in place, its location is measured and recorded, and it is packaged in an appropriate container. The package is sealed with evidence tape, and the collector writes their initials and the date across the seal. From there, every transfer to an evidence locker, a property room, a laboratory analyst or a courtroom should be logged.
How the Chain Breaks Down
Most custody problems are not dramatic. They come from ordinary mistakes made under pressure. Common issues include missing or illegible signatures on transfer logs, time gaps where no one can account for an item, inconsistent descriptions of the same item across reports, seals that were broken without documentation, packages that were opened and resealed without new initials, and item numbers that do not match between the scene log, the property room and the laboratory.
Packaging problems are another frequent source of trouble. Biological evidence sealed wet in plastic can grow mold and degrade. Items packaged together can transfer trace evidence or DNA between them. Firearms that were unloaded or manipulated before documentation can lose information about their condition when found. Clothing removed at a hospital may pass through several hands before an investigator ever sees it, and that portion of the chain is often the weakest.
Contamination Is a Chain of Custody Problem Too
The chain is not only about signatures. It is also about the integrity of the item. Modern DNA testing is sensitive enough to detect very small amounts of material, which means contamination by first responders, investigators or laboratory staff is a real possibility. Scene entry logs, the use of gloves and protective equipment, changing gloves between items, and elimination samples from personnel all help show that what was found came from the scene rather than from the people processing it. When those practices are missing, the question of where a DNA profile came from becomes much harder to answer.
Does a Broken Chain Mean the Evidence Is Thrown Out?
Not usually. In many courts, gaps or defects in the chain of custody go to the weight of the evidence rather than its admissibility, meaning the jury hears the evidence and decides how much to trust it. Exclusion is more likely when there is a real showing of tampering, substitution or contamination. That does not make these issues unimportant. A well documented gap, explained clearly to a jury by someone who knows how evidence should be handled, can create meaningful doubt about what an item really proves. Attorneys should always confirm the specific rules in their jurisdiction.
What to Request When Reviewing Chain of Custody
A thorough review looks well beyond the single custody form. It compares the scene entry log, the evidence recovery log, the crime scene photographs and their metadata, the investigator’s notes and sketches, property room intake and movement records, laboratory submission forms and bench notes, and any records of items being checked out for court or further testing. Reading these records side by side is often where inconsistencies appear, such as an item photographed at the scene that never shows up in the property log, or a package description that changes between agencies.
Frequently Asked Questions
Who is responsible for chain of custody?
Everyone who handles the evidence. Each person is responsible for documenting when they received it, what they did with it and who they gave it to.
Does evidence tracking only matter in criminal cases?
No. It matters in civil litigation, workplace death investigations, insurance matters and any case where physical evidence must be authenticated.
Can a chain of custody problem be fixed after the fact?
Sometimes testimony can explain a gap, but missing documentation cannot truly be recreated. That is why proper handling at the scene matters so much.
Can Speckin Forensics audit the chain of custody in my case?
Yes. Robert Walker reviews scene logs, evidence records, property room documentation and laboratory paperwork for Speckin Forensics clients, and identifies which gaps are harmless and which could affect the reliability of the evidence.
How Speckin Forensics Reviews Evidence Handling
Most of the evidence examined at Speckin Forensics arrives with a history, and Robert Walker’s job in a custody review is to test that history against the records. He compares the scene photographs with the evidence logs, follows each item from collection to the laboratory, and flags where the paperwork and the physical evidence stop agreeing. When a gap affects biological evidence, Speckin Forensics’ DNA and serology specialists can assess whether contamination or degradation is a real concern. Questions about lifted prints go to our fingerprint experts.
Custody gaps matter most in shooting cases, where clothing, swabs and firearms pass through many hands before testing. Our article on ghost guns shows how much evidence a single firearm can carry when it is handled correctly.
Why Work With Robert Walker and Speckin Forensics on Evidence Handling Issues
Robert Walker knows evidence handling from the inside. As a Crime Scene Investigator Specialist with the Lee County Sheriff’s Office from 1995 to 2015, he searched scenes with alternate light sources and chemical methods, developed fingerprints, and collected and packaged evidence in homicides, sex crimes, child death cases, arson and officer-involved shootings. As a former Florida Criminal Justice Standards and Training Commission Certified Instructor and the author of Crime Scene: Basics & Beyond, he has taught investigators exactly how evidence is supposed to be handled.
That combination lets Robert spot the difference between a harmless clerical slip and a gap that truly matters. He has given expert testimony in more than 100 cases and can explain evidence handling standards to a judge or jury in plain terms. Learn more about Robert Walker or contact Speckin Forensics to request a case review. Call 954-763-6134 (Florida) or 517-349-3528 (Michigan).