Page 2 - Simon Kofi News Today

>> reporter: the test instructions say findings must be confirmed by a second laboratory test. but miller says in many cases, thats not happening. especially harmful, he says considering many of the tests are done at night. >> you can imagine that that situation can lead to a lot of sort of bad reads. >> reporter: of those 30,000 mistaken arrests, the study finds nearly 90% result in a wrongful conviction. >> at this point, its the largest known specific single factor leading to wrongful convict...