Of 627 vehicles screened, 40 were pulled over for further inspection, the sergeant said.
The DUI trailer was bought three years ago with $35,000 in grant money. It allows the Murrieta Police Department to store all of its checkpoint equipment in one place.
It also allows them to take suspected drunken drivers inside to have their blood tested out of the public eye.
It costs $8,000 to operate for one evening but is funded in total by the state Office of Traffic Safety, authorities said.
A checkpoint planned Dec. 17 by the Murrieta Police Department was canceled because of rain.
"The goal of the Murrieta Police Department is to reduce traffic related fatalities, injuries, and collisions through enforcement and education programs as well as reduce Driving Under the Influence (DUI) involved collisions," Froboese said.