NBC New York says that Cameron's girlfriend Kelly Sott probably shares many of the same human flaws that her boyfriend does:

Law enforcement sources said Kelly Sott was caught passing an electric toothbrush to Douglas in a conference room inside the 500 Pearl Street courthouse after a court hearing on his federal drug charges. An official said hidden inside the handle of the toothbrush were dime bags of heroin.

The ol' electric toothbrush trick, eh? It sounds highly unlikely to succeed if you think about it even a little.

The New York Post says Cameron was playing middleman to half a pound of crystal meth—close to $20K worth—that was being moved from California to NYC to sell. The cops caught the drugs before they got here. Then they went to pick up 30 year-old Douglas:

He had been staying at the hotel for some time in a room rented by his father, and when authorities barged in, they found the place a mess and Cameron Douglas "very strung out," according to the sources.

Cameron's had drug problems in the past and Michael Douglas went through rehab himself in the 90s, because addiction really does run in the family.