A bindle in forensics is a small paper packet folded in a specific pattern to hold trace evidence like hairs, fibers, paint chips, or powders collected from a crime scene. Also called a druggist fold, it creates a leak-proof pocket that keeps tiny pieces of evidence secure without contaminating them. It’s one of the most basic and widely used tools in crime scene investigation, and its design hasn’t changed much in decades.
Why Paper Instead of Plastic
The bindle is made from a clean, plain sheet of paper. Paper is the preferred material because it allows moisture to escape, which prevents mold and bacterial growth that could degrade biological evidence. Plastic bags and containers can trap humidity, creating conditions that destroy DNA or alter chemical compositions. For tiny items that could easily be lost inside a larger evidence bag, the bindle’s tight folds keep everything contained in one small pocket.
The technique gets its alternate name, the druggist fold, from pharmacists who historically used the same folding pattern to package individual doses of powdered medication before modern pill bottles existed.
How a Bindle Is Folded
The folding sequence is standardized across most forensic agencies. According to guidelines published by the Maine State Police, the process works like this:
- Start with a clean, uncontaminated sheet of paper.
- Fold the bottom third of the paper upward.
- Fold the right side of the paper over, as if folding into thirds.
- Place the trace evidence into the pocket created by those first folds.
- Fold the left side over the right.
- From the bottom, fold upward until you’re about one to two inches from the top edge.
- Fold the top down over the rest and crease it.
- Tuck the bottom piece into the lip created by the top fold.
The result is a compact, self-sealing packet. The interlocking folds prevent the contents from spilling out even if the bindle is turned upside down or jostled during transport. One important rule: you never tape the bindle itself shut. Tape adhesive can contaminate the evidence inside or make it difficult to open the packet later without disturbing the contents. Instead, the bindle goes inside a small envelope, and that envelope gets sealed with tape.
What Goes Inside a Bindle
Bindles are specifically designed for trace evidence, the category of physical evidence too small to pick up and bag individually. Common examples include single hairs or hair fragments, textile fibers transferred during contact between people or objects, paint chips from vehicle collisions, soil particles, glass fragments, and small amounts of powder or residue. NIST (the National Institute of Standards and Technology) specifically lists hair, fibers, and paint chips as typical bindle contents.
The OSAC standard for sexual assault evidence collection also specifies that trace evidence removed during a forensic medical examination should be placed into a druggist fold inside a small sealed envelope. This means bindles aren’t only used at outdoor crime scenes. They’re a standard part of evidence collection in hospitals, forensic labs, and anywhere small physical specimens need to be preserved.
Labeling and Chain of Custody
A bindle without proper documentation is essentially useless in court. Every piece of forensic evidence, bindles included, must be trackable from the moment of collection through laboratory analysis and into the courtroom. The National Institute of Justice outlines what this chain of custody requires: the geographic location where the item was found (often supported by a photograph), a description of how the item was preserved and packaged, and a log entry from every person who physically handles the evidence.
In practice, the outer envelope holding the bindle gets labeled with the date, time, case number, a description of the contents, the location of collection, and the name or initials of the person who sealed it. Each time the envelope changes hands, the new handler creates a receipt or log entry documenting the transfer. If any link in that chain is missing or unclear, a defense attorney can challenge whether the evidence was tampered with or mishandled.
Why Such a Simple Tool Still Matters
Crime scene investigators have access to sophisticated collection swabs, vacuum filters, and electrostatic lifting devices, but the paper bindle remains a go-to method because it solves a specific problem elegantly. Trace evidence is often invisible or barely visible to the naked eye. A single fiber picked up with tweezers can be lost inside a standard evidence bag, stuck to the interior walls where it becomes difficult to recover. The bindle’s small, tight pocket keeps the specimen in one place and makes it easy for a lab analyst to unfold the paper and locate the evidence immediately.
The simplicity also reduces contamination risk. There are no chemical coatings, no static charges from plastic, and no adhesive surfaces that could alter the sample. A clean sheet of paper is about as chemically neutral a container as you can get for something that might later undergo DNA analysis, chemical testing, or microscopic comparison.