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Effectiveness: 1 Star Cost: Unknown
Use: Use for drug per se laws Medium
Use for drug per se laws
Time: Short

This countermeasure involves laws that prohibit the use of impairing drugs by drivers. This includes impairment-based statutes, which stipulate that prosecution must prove the driver was impaired (for example, by driving recklessly or erratically). It also includes per se laws in which it is illegal to operate a motor vehicle if there are specific detectable levels of a prohibited drug in a driver’s system. In some States, a positive drug test is sufficient for conviction, which is equivalent to “zero tolerance.”

Effectiveness Concerns: To date there have been no evaluations of the effect of drug-impaired-driving laws on the prevalence of drug-impaired driving or crashes.

Further information about the known research, potential effectiveness, costs, use, and time to implement are available in Appendix A1, Section 7.2.