Prosecutors are about midway through a review of 858 DUI cases that used the Alco-Sensor V breath-test device. The device was found to give incorrect readings because of a manufacturer's defect that can cause condensation to build up in the tube.
Assistant Public Defender Nona Klippen-Hughes told the San Jose Mercury News she does not think there will be that many more problematic cases.
Prosecutors apparently have corroborating evidence in most of the cases, including a second sobriety test at the police station.
The entire review is expected to be completed in the next few months.