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Chief Keef

'See Y'all Later'

I'm Going Back to Jail

11/7/2013 12:45 AM PST BY TMZ STAFF
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8:50 AM PT -- 
Law enforcement sources tell us Keef has failed 3 random drug tests ... and each time tested positive for marijuana. We're told Keef was sentenced yesterday to a drug rehab facility ... but he's currently being held in the Cook County jail until he can be transferred to the rehab center.

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Chief Keef
is headed back to jail ... and proudly blasted the news out to the world after a judge slapped him with a 90 day sentence.

Keef, aka Keith Cozart, tweeted ... "Judge Putting me Back in jail See y'all later."

A Chicago judge sent Keef to a jail rehab facility because he reportedly failed a random drug test. 

As we previously reported ... the 18-year-old rapper gets tested as part of his probation for a speeding ticket -- cops clocked him doing 110 mph in a 55, back in May.

This is Chief's second F on a drug test -- just last month he got 20 days in jail, but was released 11 days early due to jail overcrowding.

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