Sebastopol police will conduct a checkpoint targeting drunken drivers and improperly licensed motorists Saturday.

The time and location of the checkpoint wasn't revealed.

Crashes involving alcohol drop by an average of 20 percent when well-publicized checkpoints are conducted often enough, Officer David Harston said.

Police will contact drivers passing through the checkpoint for signs of alcohol or drug impairment, and for proper licensing. Those arrested face jail and significant fines.

Harston said National Highway Traffic Safety Administration statistics show checkpoints provide the most efficient and cost-effective results of any DUI enforcement strategy.

Funding for the checkpoint is provided through a grant from the California Office of Traffic Safety, through the traffic safety administration.