Samenvatting
A field study of the effect of four different SBT devices on traffic law enforcement is reported. Some methological difficulties were encountered, but the results confirm that the use of SBT can lead to an increase in D.W.I. arrests. An impact on BAC levels of D.W.I. arrests was not demonstrated but there was a trend toward lower levels. The devices, overall, proved to be acceptably accurate, reliable and useful, but some difficulties among the types were noted. Recommendations were made for improvements in sbt development, training, implementation and evaluation. The study was conducted simultaneously in six states and data were collected from over 6000 d.w.i. Investigations.