Forensic Gel Lifts Techniques

The video tutorial from the National Forensic Academy explains the use of gel lifts to collect footwear impressions. It covers the process of finding impressions using oblique lighting, preparing and applying gel lifts, and ensuring no air bubbles are trapped. The tutorial also emphasizes the importance of documenting and photographing impressions before collection. Finally, it provides guidance on packaging and storing the collected impressions to preserve evidence.

What is the primary purpose of using gel lifts in forensic investigations?

• To clean the crime scene

• To enhance the visibility of fingerprints

• To measure the size of the crime scene

• To collect and preserve footwear impressions

What lighting technique is used to find a footwear impression on the floor?

• Backlighting

• Fluorescent lighting

• Oblique lighting

• Direct lighting

What is the first step in preparing a gel lift for use?

• Applying the gel lift directly to the impression

• Removing the acetate film from the gel lift

• Heating the gel lift

• Cutting the gel lift to size

Why is it important to avoid air bubbles when applying a gel lift?

• They make the gel lift sticky

• They cause the gel lift to dry out

• They can distort the impression

• They make the gel lift heavier

How long should a gel lift be applied to ensure effective evidence collection?

• 20 minutes

• 10 minutes

• 5 minutes

• 15 minutes

What is the purpose of using a roller after applying the gel lift?

• To smooth out air bubbles

• To remove excess gel

• To add texture to the gel

• To cut the gel to size

What should be done before applying the gel lift to a footwear impression?

• Clean the area thoroughly

• Document and photograph the impression

• Apply a protective coating

• Measure the impression

What is the recommended method for packaging a gel lift after collection?

• In a plastic bag

• In a shallow box with taped corners

• In a metal container

• In a glass jar

What should be done if the footwear impression is difficult to see after lifting?

• Reapply the gel lift

• Use oblique lighting to view the impression

• Discard the gel lift

• Apply more gel

Why is it important to keep the impression side up during packaging?

• To make it easier to transport

• To prevent contamination

• To avoid smudging the impression

• To ensure it dries properly