One torn seal or the wrong bag can undo months of forensic work. Selecting the right crime scene investigation bags protects evidence from contamination, tampering, and a broken chain of custody, often the line between a case that holds up in court and one that doesn’t. Grab the wrong bag and biological evidence degrades, prints smear, or a defense attorney finds an opening. Match the container to the evidence type, and you walk onto any scene ready.

Why Evidence Packaging Matters in Crime Scene Investigations

A mislabeled or damaged bag can knock evidence out of a case entirely, no matter how strong it looked at the scene. Courts expect proof that nobody touched, altered, or swapped evidence between collection and testimony, and the bag itself supplies that proof.

Investigators depend on the right material, seal, and label to keep biological samples, prints, and trace evidence intact until a lab technician opens it under controlled conditions.

What to Consider When Choosing Crime Scene Investigation Bags

A few details make bag selection simple: the evidence type, the fit, the need to see the contents, and the seal. Cover those four, and the packaging holds up through trial:

  1. Evidence Type: Different types of evidence demand specific packaging solutions. Biological samples (like blood or hair) necessitate airtight and moisture-resistant bags to prevent degradation. Fragile items (such as glass fragments) require cushioned bags to prevent breakage during transport.
  2. Size and Fit: Choose bags that comfortably accommodate the evidence without unnecessary excess space. This prevents movement during transportation, minimizing the risk of damage.
  3. Transparency: Transparent bags are advantageous as they enable visual confirmation of the evidence’s contents without compromising its security.
  4. Secure Sealing: Opt for bags with reliable sealing mechanisms, such as tamper-evident seals. These mechanisms ensure that the evidence remains untouched and secure until it reaches the laboratory.

Paper vs. Plastic Evidence Bags

Paper and plastic evidence bags aren’t interchangeable, as each one protects a different kind of evidence in its own way. Paper bags breathe, letting blood, DNA swabs, and other biological material dry out instead of growing mold inside a sealed pouch.

Plastic evidence bags block moisture, which makes them a better fit for firearms, documents, and electronics that need to stay dry. Departments that stock both pair paper for wet biological evidence with tamper-evident plastic bags for everything else.

Tamper-Evident Seals, Serialized Numbering & Writable Panels

Three features combine to make a bag tamper-evident: the seal, the serial number, and the writable panel. Press a tamper-evident seal shut, and it locks immediately, revealing a permanent VOID message the moment anyone tries to open it, the same technology behind Connover’s Secur-Pak line.

Serialized numbering and barcoding turn each bag into a tracked, loggable unit, while a writable panel gives collectors room to log the case number, date, and location right on the bag.

Agencies can spec all three into a single bag through custom security packaging.

Choosing Bags by Evidence Type

Not every piece of evidence calls for the same bag. Crime scene evidence bags split into a few specialized categories, each built for a different stage: collection, transport, or long-term storage.

Choose between the following:

      • Crime Scene Store Evidence Bags: Built for the moment investigators bag evidence at the scene, giving them a secure, ready-to-label option before anything moves off-site.
      • Evidence Security Bags: Made from tear-resistant material that holds up through repeated handling, transport, and storage, keeping the contents secure the whole time.
      • Evidence Collection Bags: The most versatile option here, built to hold a wide range of evidence types and often transparent, so investigators can confirm the contents by sight instead of opening the bag.

    Best Practices for Transporting and Storing Evidence

    A single evidence bag rarely travels alone. Pack narcotics, biological samples, and firearms together in one transport case, and a leak or puncture in one bag can contaminate everything sitting next to it. A few practices keep that risk contained and the record clean.

    1. Separate Evidence by Type: Transport narcotics, biological samples, and firearms in separate containers or compartments so damage to one bag never reaches another.
    2. Secure Bags During Transit: Store bags upright in a rack or case instead of loose in a trunk or on a seat, since shifting and impact are common causes of torn or punctured bags.
    3. Log Every Handoff Immediately: Record the transfer the moment a bag changes hands or location, not at the end of the shift, so the paper trail matches the actual timeline.
    4. Store in a Locked, Climate-Controlled Room: Keep evidence bags away from heat, moisture, and unauthorized access. Humidity and temperature swings degrade biological evidence faster than almost anything else.
    5. Set a Retention Schedule: Establish how long each case’s evidence stays in storage, and assign someone to test, return, or dispose of it on schedule.

    Departments that build these habits into daily routine spend less time explaining gaps in the record on the witness stand.

    Get the Bag Right, Get the Case Right

    Every case starts long before a jury sees the evidence. It starts with the bag that holds it. Connover Packaging manufactures tamper-evident, serialized, and custom evidence bags that survive collection, transport, and testimony without a single gap in the record.

    Explore evidence bag options or request a quote to outfit your department with packaging built for the job.

    FAQs About Crime Scene Investigation Bags

    Can you reuse evidence bags?

    No, reusing a bag risks cross-contamination and breaks the tamper-evident seal that proves nobody touched the contents, so agencies use a new bag for every item collected.

    How do I know what size evidence bag I need?

    Match the bag size to the item: small bags for narcotics or shell casings, larger or oversized bags for clothing, weapons, or bulky items.

    Is there a minimum order quantity for evidence bags?

    Connover ships stock sizes with no minimum order, so a single department or a statewide agency can order exactly what it needs.

    How long does it take to receive an evidence bag order?

    Stock evidence bags typically ship within a day or two, while custom-printed or serialized orders take about four weeks once artwork is approved.