via
slashdot:
SFPD Breathalyzer Error Puts Hundreds Of DUI Convictions In Doubt For at least six years, the police officers in charge of testing the 20 breathalizyers used by the Police Department did not carry out any tests on the equipment.
Officers instead filled the test forms with numbers that matched the control sample, said Public Defender Jeff Adachi, throwing countless DUI convictions into doubt.
[...]
Gascon said there did not appear to be any malicious intent behind the police officers' actions. He said the coordinators were apparently just too lazy to perform the test required every 10 days.
"If we find cases where this evidence was central to the case," Gascon said, the District Attorney’s Office would dismiss the case.