Alcohol breath tests, a linchpin of the criminal justice system, are often unreliable, a New York Times investigation found.

A million Americans a year are arrested for drunken driving, and most stops begin the same


A fateful trip


The drunkometer

Starting to panic

Secret software

"Throw caution to the wind"

Insomnia and shame

Disregarding truth and accuracy

Homebrewed chemicals

"Serious errors of judgment"

42,000 convictions at risk