DUI Checkpoints in Arizona

Can the police randomly stop motorists in the Grand Canyon state?

Sobriety checkpoints are permitted in Arizona (see 691 P.2d 1073 (Ariz. 1984)). These checkpoints (also referred to as "mobile checkpoints" or "roadblocks") are police traffic stops that are not tied to any specific or individual suspicions. The locations chosen for checkpoints are temporary and "random."

Arizona estimates that it saves approximately $62,500 per checkpoint in regard to police resources, costs of travel delay and the value of mobility losses by impaired drivers apprehended and sanctioned; the costs of conducting a checkpoint average about $8,900.

During a sobriety checkpoint, drivers are briefly detained and interviewed after which suspicious drivers are subject to sobriety tests. The goal of these checkpoints is to weed out inebriated drivers and therefore keep the roads safer. According to the Center for Disease Control and Prevention (CDC), sobriety checkpoints have the potential to prevent nearly 1 out of 10 DUI-related deaths.

Doesn't a police officer need to have probable cause before stopping someone?

Yes, probable cause is required for a traffic stop. But the U.S. Supreme Court has ruled that the dangers from drunk driving outweigh the "degree of intrusion" of sobriety checkpoints and they are therefore an exception to the search and seizure provisions of the U.S. Constitution. Subsequently the National Highway Safety Transportation Board has issued guidelines for police when administering a sobriety checkpoint. Perhaps the most important guideline is that the police must publicize the checkpoints ahead of time. Each state may also impose its own guidelines (or the states may outlaw checkpoints entirely, as 12 states have done).

Learn more about Arizona’s DUI laws.

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