New York state corrections officials believe that approximately 2,000 prisoners were subject to a flawed drug test that produced false positives and led to increased punishment across the state, according to documents obtained by WNYC/Gothamist. 

The problem may have been caused by a chemical mishap known as “cross reactivity, ” which can lead to a clean subject falsely appearing to have used drugs, the documents say.

Read the full story at Gothamist.