Police rely on alcohol breath tests to convict drunken drivers. But what happens when the machines they use aren’t reliable? Stacy Cowley of The New York Times looked into the problem of faulty breath test machines and found thousands of cases where the tests were thrown out. On this episode, Stacy breaks down how she discovered unreliable breath tests and the consequences they pose for real people.

EPISODE NOTES: https://www.ire.org/archives/40664