He was then taken to the West Valley Detention Center in Rancho Cucamonga and charged with a misdemeanor offense of being under the influence of drugs.
This is just the latest incident in what has become a spectacular downfall for a county leader, with repeated accusations of drug use, and charges of conspiracy, bribery, embezzlement and grand theft.
Postmus acknowledged a history of drug abuse in a speech before the board of supervisors last year, saying that despite his illness, his struggle "did not interfere with my service as county assessor." In the past year he has claimed that he was sober and in a recovery program.
Postmus served on the board of supervisors starting in 2005 and was elected county assessor one year later before resigning the post during a corruption scandal.