Hey Fuzz,
As others stated, generally it is a urine test. They will be looking for the presence of any and all illegal drugs, especially pot, crack, meth etc. Also, one test shows them if you have taken one of the chemical 'strippers' that supposedly cover up drug use.
Make sure to tell them if you are taking ANY over the counter or prescription drugs, as some meds have been known to show a false positive.
Dreamer
Forums Administrator