![Forensic Drug Testing | HowStuffWorks](/e69yszg/483.jpg)
Forensic Drug Testing | HowStuffWorks
A more specific way to test drugs is with the microcrystalline test in which the scientist adds a drop of the suspected substance to a chemical on a slide. The mixture will begin to form crystals. Each type of drug has an individual crystal pattern when seen under a polarized light microscope.