The Veritable Pocket Laboratory Cops Have to Carry to Test Drugs on the Street

The cops pull over a car doing 75 in a school zone. The driver is behaving errratically, so they pull him out of the car for a search and bingo: a small bag of white dust in the perp's pocket. But what is it--baking soda, cocaine, arsenic? To find out, they rely on this series of chemical tests. More