Portable breath alcohol testers and drinking-driving behavior of convicted drunk drivers.

The use of portable breath alcohol testers by convicted drunk drivers during a drinking-driving educational program had a nonsignificant impact on the frequency of drinking-driving episodes. The use of breath alcohol testers also failed to significantly reduce peak blood alcohol concentration during drinking-driving episodes. However, portable breath testers were used by certain drunk drivers in deciding not to drive after drinking as well as to slow or stop their drinking on occasion.