Positive amphetamine tests, which includes methamphetamines as well as prescription drugs such as Adderall, rose more than 8 percent in both the general U.S. and safety-sensitive workforces compared with 2015. Illinois' rate, at 0.88 percent, is less than the national average of 1.1 percent, though it is significantly higher in parts of the western and southern edges of the state, such as Rock Island and Carbondale.