Kenneth Markman, 47, was arrested Friday morning at the courthouse, the Los Angeles Times reported. Bail was set at $145,000.
Sheriff's Capt. Mike Parker said Markman was carrying balloons containing heroin and methamphetamine, a package of marijuana and hypodermic needles. The total value of the drugs was put at $30,000.
Sheriff's deputies used a drug-sniffing dog while Markman was waiting for his client, Parker said. The dog's behavior suggested Markman had drugs in his briefcase.
Markman also had a package of drugs in an inside suit pocket, Parker said.
The lawyer faces a long list of charges including conspiracy to distribute narcotics.