Behavioral monitoring of DUI offenders with the Alcohol Ignition Interlock Recorder.
OBJECTIVE
To evaluate patterns of blood alcohol concentration (BAC) and driving logged on the ignition interlock recorder and to assess whether this event record is a useful outcome measure for a behavioral intervention.


METHODS
Descriptive analyses of recorder data and multivariate analysis of the predictors of high BACs associated with a motivational intervention for driving-under-the-influence (DUI) offenders using an interlock.


METHODS
Two interlock service centers in Alberta, Canada.


METHODS
1309 first-time and multiple DUI offenders who agreed to participate during interlock installation.


METHODS
A human-services (supportive guidance) intervention based on motivational interviewing and pragmatic counseling was delivered to interlock users in Calgary, but not to interlock users in Edmonton, Canada.


METHODS
This report summarizes the patterns and predictors of BAC warnings (0.02-0.039%) (20-39 mg/dl) and failures (> or = 0.04) (> or = 40 mg/dl) from more than 3 million in-vehicle breath tests. Data come from three sources: driver records, questionnaires and the interlock.


RESULTS
From the beginning to the end of the interlock use period, there was a significant linear decline in the proportion of positive BAC driving to total driving. After controlling for prior offenses, demographics and reported drinking levels, offenders in the intervention site (Calgary) were less likely to have recorded fail BACs than were offenders in the control site (Edmonton). The temporal patterns of BAC fails with the interlock mimic the high-risk periods for DUI arrests and alcohol-involved fatal crashes.


CONCLUSIONS
The interlock successfully blocks drinking and driving during high-risk periods. Preliminary recorder data suggest the services intervention may be affecting DUI behavior.
Marques
P R
PR
Public Services Research Center, Pacific Institute for Research and Evaluation, Landover, Maryland 20785, USA.
Voas
R B
RB
Tippetts
A S
AS
Beirness
D J
DJ
D000416:Alberta; D000428:Alcohol Drinking / Q000097:blood / Q000523:psychology; D000437:Alcoholism / Q000097:blood / Q000523:psychology*; D001334:Automobile Driving / Q000331:legislation & jurisprudence / Q000523:psychology*; D003376:Counseling; D003617:Dangerous Behavior; D000431:Ethanol / Q000097:blood; D006801:Humans; D015999:Multivariate Analysis; D012309:Risk-Taking
D000431:Ethanol