Urine drug tests check for the presence of illegal drugs in one's urine. Urine tests may be given to screen new hires or athletes or to check anyone else who is suspected of illegal drug use. A urine test involves the simple collection of one's urine in an approved collection container, and then a lab can check for the presence of drugs. To learn more about drug testing, read our Urine Drug Test Guide and interviews with drug test experts Greg Johnson, Elina Smith and Mike Clark.