Anchorage police said Friday they will target drivers high on marijuana through the weekend and Monday in anticipation of the unofficial stoners holiday “420."

“With the recent legalization of recreational use of marijuana in the state of Alaska, police anticipate a possible increase of impaired drivers that may be celebrating the ‘420 holiday’ this year,” said Anchorage Police Department communications director Jennifer Castro in a news release.

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“The origin of the term ‘420’ usually depends on who you ask but is celebrated by marijuana consumers around the world every April 20,” the release says.

The OUI (operating under the influence) marijuana detail will begin Friday evening and continue through Monday, police said.

Four patrol units and a drug recognition expert make up the detail. The police department has four recognition experts, Castro said in an email. They received training through the International Drug Evaluation and Classification Program.

The program originated in Los Angeles in the early 1970s when officers noticed...