Page 8 - The Smoking Gun Gunshot Residue

SCHEDULE 2:

This lab schedule is designed to take 3 days, with 1.5 hours per class.

DAY 1

Cover the background material on Gunshot Residue.

Distribute lab procedures and review them to ensure students are prepared for the lab. Assign pre-lab
questions for homework.

DAY 2

Review the lab procedures and the data collection sheet. Emphasize that when students add the
diphenylamine solution, they must observe the swab immediately. The acid will cause the swab to turn
black in a short period of time, which will obscure the results.

Instruct students to follow the lab procedures for Lab 1. They should fill out their data collection sheet
for this lab by the end of class. Discuss student results.

DAY 3

View the video clips about gunshot residue, pausing between each clip to talk about what is being done.

Have students follow the procedures for Lab 2 while completing the data collection sheet, then answer
the post-lab questions.

Discuss student theories about the case.
If this is your only lab from The Mystery of Lyle and Louise, prepare for a mock trial.

8 THE MYSTERY OF LYLE AND LOUISE