Scott Thorson — Liberace’s Ex-Lover BUSTED For Meth

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Scott Thorson — Liberace”s one-time boyfriend who was portrayed by Matt Damon in “Behind the Candelabra” — is back in jail because of a dirty drug test …. our sources has learned.

Law enforcement sources tell us Thorson was popped for violating probation… after he FAILED a random drug test.  Sources close to Scott tell our sources he tested positive for meth … a drug he”s struggled with for years.

FYI — Thorson had recently gotten out of the slammer for a burglary and identity theft conviction.

Thorson suffers from stage II colon cancer.  Dennis Hof — who runs the famous Bunny Ranch brothel in Nevada — has been helping Thorson and even got him out of jail recently so he could get proper medical treatment.