Lesson 2: Securing the Scene: Collecting Evidence Copy

Lesson 2: Securing the Scene!

Wrongdoers, beware! Learners visit the scene of the crime and use real forensic techniques (such as triangulation) to begin the search for trace evidence that will point to a thief!

Use special care to keep learners out of the “crime scene” area and use the opportunity to underline how careless investigators can contaminate crime scenes. Encourage students to move methodically through the crime scene as they measure; in this lesson make the distinction between evidence and suspicions.

Lesson Objectives

  • Identify evidence at a mock crime scene
  • Determine which evidence needs to be preserved against weather and time
  • Take measurements and use triangulation to plot the location of evidence
  • Repeat this process on a map of the “real” crime scene

Next, simply click the links below for further instructions and steps on how to get started!


  • crime scene tape
  • measuring tape
  • masking tape
  • black marker
  • 1/4 inch graph paper 
  • sand
  • membership card
  • wipes
  • lotion
  • Student Book pages (on Resource CD)

Students (Groups of Three)

  • 3 pencils
  • 1 ruler
  • 1 black marker
  • 1 measuring tape
  • 3 copies of mock crime scene sketch