Kicking off a weekend bound to include Halloween parties, Santa Rosa police Friday night will hold a checkpoint looking for impaired drivers.

Police officials aren’t yet releasing the location of the checkpoint, saying only that it will be somewhere in the city and run from 7 p.m. to 2:30 a.m. Saturday, according to a news release issued Wednesday.

Sgt. Summer Black said Halloween’s proximity to the weekend was a factor in having a checkpoint on Friday.

Santa Rosa police and other Sonoma County law enforcement agencies routinely hold checkpoints to coincide with holiday events, looking for drivers who have been drinking or are under the influence of drugs. Officers also check for valid driving licenses.

The vast majority of drivers stopped in a checkpoint speak to an officer briefly and then are waved on. Others are given a closer evaluation to determine their sobriety or for a license review.

Publicizing checkpoints helps reduce DUI cases, according to police studies.

You can reach Staff Writer Randi Rossmann at 521-5412 or randi.rossmann@pressdemocrat.com. On Twitter@rossmannreport.