San Diego County DUI enforcement will be erecting California drunk driving sobriety checkpoints and conducting extra patrols this Memorial Day weekend as part of a multi-agency "Avoid DUI Campaign."

California drunk driving checkpoints will be set up in Oceanside, Escondido and San Diego. From 6 p.m. through midnight Monday, more California drunk driving police officers than usual will be patrolling Escondido, San Diego, Chula Vista, Coronado, Encinitas and National City looking for San Diego DUI drivers.

These checkpoints must be in compliance with California safeguards and guidelines.

Sheriff's deputies will be doing California drunk driving patrols in Encinitas, Del Mar, Imperial Beach, San Marcos, Solana Beach, Vista and the county's unincorporated areas.

The California Highway Patrol will also step up its efforts to stop drunk driving on the county's highways and freeways. About 80 percent of all available CHP officers will be working this weekend.

In other drunk driving news, the son of a Merced County District Attorney pleaded guilty Friday morning to all charges in connection with a vehicle crash that killed an Oakland man and critically injured his friend who remains in a coma.

Morse, 18, pleaded guilty in Sonoma County Superior Court to three felony charges, three misdemeanor charges and admitted 13 enhancements to the charges.

He faces 15 years in state prison when he is sentenced July 15. He traveled to Sonoma County for Friday's hearing from Florida where he is undergoing rehabilitation, his DUI defense attorney Chris Andrian said.

Morse pleaded guilty to felony counts of vehicular manslaughter while intoxicated but without gross negligence, DUI and DUI with a blood/alcohol level of 0.08 percent or more.

He also pleaded guilty to misdemeanor counts of being under age 21 and driving with alcohol in his vehicle, having a fraudulent or false evidence of age and identity and possessing less than an ounce of marijuana.

The enhancements he admitted concern causing great bodily injury or death to the three crash victims and having a blood/alcohol level of 0.15 percent or more.

He was visiting his friend Ryne Spitzer, 19, of Merced, a Sonoma State University student, on Feb. 14. The two were drinking alcohol at a party at SSU and later purchased alcohol from a Safeway store. They were returning to SSU from Sebastopol in a 1998 Volvo on Stony Point Road near state Highway 116 when Morse failed to stop at a red light and broad-sided a 1988 Honda that was driving east on Highway 116. The collision killed the Honda driver Alexander Ruiz, 25, of Oakland. Ruiz's passenger Vanessa King, 25, of Berkeley, suffered a broken arm and collarbone and facial lacerations. Spitzer suffered brain injuries and paralysis. Morse was not injured.

California criminal defense lawyer Andrian said Morse changed his not guilty plea "because it is the only right thing to do." "My client had absolutely no interest in contesting any of this and didn't want to prolong this for one additional day, he's remoreseful," California criminal defense attorney Andrian made clear.