Random alcohol testing reduced alcohol-involved fatal crashes of drivers of large trucks.
OBJECTIVE
This study examined the impact of random alcohol testing, implemented on August 1, 1994, on the likelihood that the driver of a large truck involved in a fatal motor vehicle crash was alcohol-involved.


METHODS
Among fatal crashes, the proportion of alcohol-positive large truck drivers (intervention group) was compared with the proportion of alcohol-positive light passenger vehicle drivers (control group). Annual Fatality Analysis Reporting System (FARS) data (1988-2003) were compiled for each of the 50 states and Washington, D.C., for the control and intervention groups. Using these pooled cross-sectional data, logistic regression modeled the likelihood that a driver was alcohol-positive (blood alcohol concentration > 0) before compared with after random alcohol testing. We attributed the difference-in-difference (the difference in likelihoods of being alcohol positive pretesting versus post-testing in large truck versus passenger vehicle drivers) to the impact of random testing.


RESULTS
Drivers of large trucks were 18.6% less likely to be alcohol-involved after random testing was implemented than before random testing (odds ratio [OR] = 0.814, 95% confidence interval [CI]: 0.713-0.930). The control group of passenger car drivers was 4.7% less likely to be alcohol-involved after random testing was implemented (OR = 0.953, 95% CI: 0.924-0.983). The net reduction in the odds of alcohol involvement for drivers of large trucks was 14.5% (OR = 0.855, 95% CI: 0.748-0.976).


CONCLUSIONS
Controlling for the general declining trend in alcohol-involved drivers in fatal crashes, random alcohol testing was correlated with a 14.5% reduction in alcohol involvement among large truck drivers.
Snowden
Cecelia B
CB
Pacific Institute for Research and Evaluation, 11720 Beltsville Drive, Suite 900, Calverton, Maryland 20705-3102,USA. snowden@pire.org
Miller
Ted R
TR
Waehrer
Geetha M
GM
Spicer
Rebecca S
RS
D000063:Accidents, Traffic / Q000401:mortality / Q000517:prevention & control*; D000328:Adult; D000368:Aged; D000435:Alcoholic Intoxication / Q000097:blood / Q000175:diagnosis* / Q000401:mortality; D002423:Cause of Death; D003430:Cross-Sectional Studies; D000431:Ethanol / Q000097:blood*; D005260:Female; D006801:Humans; D016013:Likelihood Functions; D008297:Male; D008875:Middle Aged; D018986:Motor Vehicles; D011897:Random Allocation; D015813:Substance Abuse Detection; D014481:United States
D000431:Ethanol