why is this still happening? (arrests for card holders)

see Medical marijuana patients continue to be caught in legal web - Boulder Daily Camera

But patients with valid registry cards still find themselves in Boulder County Jail, and dispensary owners and growers still worry about finding themselves on the wrong side of the law -- or simply a suspicious officer.

Nicholas Polashek, a local musician and poet who goes by Maus Isi, says that's what happened to him.

He was pulled over for having a dirty license plate, and a sheriff's deputy noticed he had some hash. He didn't have his medical marijuana card on him, but the deputies were able to confirm he had a valid card with another officer who had had a similar encounter with Polashek a few weeks earlier, he said.

Polashek, who uses marijuana to ease the joint pain from his hip dysplasia, spent the night in jail and is facing a felony possession charge.

Patients and advocates say cases like Polashek's show that law enforcement still hasn't accepted that marijuana is legal for authorized patients and that prosecutors need new policies.

(see link for entire article)

Charges are still pending against this guy!? So what's up?!