Title: Define positive control and negative control.
Course: Forensic Technology (15055) > Section: Examining Trace Evidence

Definitions should include

- positive control—a sample known to contain a particular substance, which would cause a positive result and verify that the test works.
- negative control—a sample known not to contain a particular substance, which would produce a negative result and verify that the test works.

Process/Skill Questions:

- What do you think would happen if there were no controls in a test?
- Why is it important to have both a positive and negative control?