'Big Brother' Winner Arrested for Drug Dealing

Adam "Baller" Jasinski won "Big Brother" in 2008 -- and now he'll be sharing living space with even more strangers behind bars ... because cops say he used his $500,000 winnings to fund a drug dealing business.

According to FOX 25, Jasinski was busted Saturday night by the DEA with 2,000 oxycodone pills during an attempted drug deal in North Reading, MA. Jasinki was thrown in jail and charged with possession of oxycodone pills with intent to distribute.

Cops say Jasinski admitted to funding his illegal venture with his $500,000 winnings from the show. He'll remain in police custody until his next hearing on Thursday.

Adam faces up to 20 years in the slammer and a $1 million fine.

UPDATE: Big Brother was definitely watching when Jasinski got busted -- the person he was allegedly trying to sell the pills to was a government witness who was wearing a wire.

Cops say Jasinski pulled a pill-stuffed sock from his pants and handed them over -- and that's when they swooped in for the bust.

The arresting officer also claims Jasinski did not go quietly into custody, accusing the reality star of putting up a struggle before he got Adam into a fresh pair of cuffs.