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

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A fateful trip

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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