Drug Sting in Anaheim Nets Judge : Investigation: Police were tipped off earlier this year that the municipal court commissioner was using cocaine on a ‘regular basis.’

Capping a six-month investigation, Anaheim police said Friday that they caught an Orange County traffic judge in a sting operation and arrested him on suspicion of cocaine possession.

Police said they received a tip earlier this year that Municipal Court Commissioner Robert K. Tuller Jr., 46, based in the Fullerton courthouse, used cocaine on a “regular basis.” That information prompted an investigation by members of the Anaheim police force, the district attorney’s office and state Bureau of Narcotics Enforcement.

Tuller was invited by undercover agents to a “party” at the Anaheim Sheraton hotel Friday, police said. When Tuller allegedly bought an unspecified quantity of cocaine from an undercover agent with the state Bureau of Narcotics Enforcement, the arrest was made, according to a statement put out by Anaheim Police Chief Joseph T. Molloy.

After being booked, Tuller posted bail of $5,000 and was released on his own recognizance at 4 p.m. by Municipal Judge Margaret Anderson, the presiding judge in the Fullerton courthouse.

Tuller, leaving his home Friday night with a man he identified as his attorney, said when asked about the charges: “I don’t know anything about it. That’s it.”

A lifetime Fullerton resident, Tuller was a deputy marshal in the North County Municipal Court in Fullerton, then practiced law in private practice for 13 years. He was appointed to the bench as a court commissioner by North Court municipal judges in 1986.

He took the bench as a commissioner on July 7 of that year. With the exception of some restrictions in serious felony cases, a court commissioner essentially carries out the same day-to-day duties as judges.

Times correspondent Tom McQueeney contributed to this report.