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NBA Star Isaiah Rider The Proof Is in My Pee

10/9/2011 12:30 AM PDT

NBA Star Isaiah Rider -- The Proof Is in My Pee

Former NBA Slam Dunk champion Isaiah "J.R." Rider claims he's been nothing less than a model parolee -- and last month, he proved it ... with his pee.

As we previously reported, Rider was arrested this week for a probation violation -- after allegedly failing to complete several probation requirements.

One of his probation officer's claims is Rider never took a required urinalysis -- a claim that has Rider p.o.'d at his P.O. ... because he actually has the receipt to prove he peed in a cup.

The document doesn't give any details about his results -- but it does show Rider completed the test on September 19th, 2011. It cost him $5.50.

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