Santa Barbara County Sheriff's Deputies and Santa Barbara Police were among the officers at DUI checkpoints on Friday the 13th.
Senior Deputy Jeff Farmer said they chose the night to send a message to thousands of people celebrating UCSB graduations.
About 6,000 students will be attending more than half a dozen ceremonies on campus over the Fathers Day weekend.
And thousands of relatives are making their way to Santa Barbara and Goleta to watch and celebrate their success.
Denise and Chip Flor made hotel reservations last July to attend their daughter Erica's graduation.
They applaud the officers for making the roads safe by looking out for impaired drivers.