KNTV NBC Nightly News With Lester Holt June 4, 2024 00:23:00
>> reporter: the test instructions say findings must be confirmed by a second laboratory test. but miller says in many cases, that's 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, it's the largest known specific single factor leading to wrongful convictions in the united states. >> reporter: is it that the tests themselves are flawed? or are the dep...