Al Gore III, son of the former vice president, was arrested in California early Wednesday morning for suspicion of possessing marijuana and prescription drugs.

Gore III was allegedly driving a blue Toyota Prius at speeds over 100 mph when he was pulled over around 2:15 a.m. on the San Diego freeway south of Los Angeles. Smelling marijuana, police searched the car and found less than one ounce of marijuana and prescription drugs Xanax, Valium, Vicodin and Adderall, Orange County Sheriff's Department spokesman Jim Armormino said. The last pharmaceutical is a treatment for attention deficit disorder.

"He does not have a prescription for any of those drugs," Amormino said.

Gore, 24, was released from a men's jail in Santa Ana after posting $20,000 bail.

This is the second time he was arrested on a marijuana possession charge. Police in Montgomery County, Md., pulled over Gore in December 2003 and noticed the smell of pot. Police were also tipped off by the open windows and sunroof despite the freezing temperature.

Gore, who at the time was a Harvard university student, and his two male passengers were charged with a misdemeanor count of possession of marijuana and released. The youngest of Al and Tipper Gore's four children then completed substance abuses classes as a pretrial diversion program, before settling the charges.

Gore was also ticketed for reckless driving by North Carolina police in August 2000, and military police arrested him for drunk driving near a military base in Virginia in September 2002. Gore III now lives in Los Angeles and is an associate publisher of GOOD, a magazine about philanthropy aimed at young people.

The Associated Press contributed to this report.