Lifting Techniques and Evidence Packaging

Why Lifting Technique Matters

Developing a latent print is only half the job. A perfectly developed impression becomes worthless evidence if the lift distorts it, tears it, or traps air bubbles. Lifting transfers the developed print from its original surface onto a stable medium that can be packaged, stored, transported, and later compared in the laboratory. Every decision you make—which lifter to choose, how to apply it, how to peel it—directly affects whether that print is usable in court.

The Three Lifter Types

Rubber lifters are flexible sheets coated with a pressure-sensitive adhesive. They come in black and white; choose the color that contrasts with your dusting powder. Black lifters are used after white or light-gray powder; white lifters are used after black or dark powder. Press the lifter firmly from one edge to the other, working out air bubbles as you go. Peel slowly and evenly at a low angle—never yank straight up. Once peeled, press the backing card onto the adhesive side immediately to protect the lift. Rubber lifters work best on smooth, flat surfaces.

Gel lifters have a thick, soft gel layer that conforms to irregular contours. This makes them the right choice for textured surfaces such as brick, leather, rubber, and some painted wood. Apply with firm, even pressure, using a roller or your fingers through a protective glove to ensure full contact. Peel at the same slow, low angle as rubber lifters. Gel lifters capture three-dimensional detail that flat lifters miss, so they are also useful on surfaces that have been dusted and where fine ridge detail might otherwise be lost.

Hinged lifters (also called hinged clear lifters) consist of a transparent cover film hinged to a backing card. Fold the cover film back, apply the exposed adhesive film to the dusted surface, smooth out bubbles, then fold the cover back down over the lift to protect it. The result is a self-contained, see-through lift that can be read directly without mounting. Use hinged lifters on smooth, flat surfaces when you want an immediately viewable, protected lift.

Application and Peeling Technique

Regardless of lifter type, the same principles prevent distortion:

1. Photograph the developed print before touching it—this photograph is your reference for later comparison.

2. Lay the lifter down from one edge, never dropping it flat all at once.

3. Smooth firmly and consistently to exclude air bubbles.

4. Peel slowly at a shallow angle (roughly 15–30 degrees) to avoid stretching the adhesive and the ridges with it.

5. Mount or close the lifter immediately—exposed adhesive collects dust and debris within seconds.

Labeling and Packaging

Every lift must be labeled before it leaves your hands. An unlabeled lift is inadmissible and may compromise an entire case. At minimum, each evidence label must include:

• Case number
• Date and time of recovery
• Technician's initials (or full name, per agency policy)
• Description of the substrate (e.g., "black rubber lifter from smooth glass surface")
• Location description (e.g., "north-facing exterior window, kitchen, Item 7")

Backing cards for rubber and gel lifters should be dated, labeled, and sealed with evidence tape across the seam. Hinged lifters are sealed by closing the cover film; add an evidence tape seal at the edge and apply the label to the backing. Place finished lifts into evidence envelopes, seal, and initial across the seal.

Never write directly on a backing card before the lift is mounted—pen pressure can distort the adhesive surface.

Chain of Custody

Chain of custody (CoC) is the documented record showing who collected evidence, who handled it, and where it has been at every moment. A broken or incomplete chain can cause evidence to be excluded from trial. Every transfer—from scene to packaging, from technician to evidence locker, from locker to lab—requires a signature, date, time, and purpose.

The evidence submission form is completed by the collecting technician and accompanies the evidence package. The mock evidence locker log records each deposit and each withdrawal. When you retrieve a partner's package, you must verify that all seals are intact, all labels are present, and the CoC form accounts for every prior transfer before you sign. If a field is blank, note it immediately and do not sign as complete.

Safety in the Lab

Many fingerprint powders contain fine particulates. Wear nitrile gloves at all times—both to protect evidence from your own prints and to protect your skin from powder. Work in a ventilated area or at a downdraft table when dusting. If a lift is taken from a surface that was a potential biohazard (blood, body fluids), treat the lift and all packaging as biohazardous until confirmed otherwise; double-bag and label accordingly. Dispose of used swabs, brushes, and excess powder per your facility's hazardous-waste protocol.