Massachusetts prosecutors are throwing out more than 20,000 criminal drug cases over a scandal involving a former state chemist who admitted faking tests. Annie Dookhan pleaded guilty in 2013 to falsifying evidence in tens of thousands of cases during her nine years working at a state crime lab in Boston. In many of the cases, she identified the evidence as illegal narcotics without even testing the materials. We’ll have more on this case later in the broadcast.