NHTSA's "Crash Risk" study is the first large-scale study in the United States to include drugs other than alcohol. This study estimated the odds of being involved in a crash if a driver was alcohol- and/or drug-positive. A positive result for a drug does not necessarily mean the driver was impaired at the time of testing, only that the drug was present in the body. Data from this study contributes to a better understanding of the nature and scope of the drugged driving issue.

• Report
• Research Note