A judge said he was concerned about comments apparently made in rehab about being good at using guns and knives.
The 24-year-old was arrested on Friday after being thrown out of a rehab treatment facility in California for rule breaking.
The judge ordered Brown to stay in jail until April 23rd because of his "inability to stay out of trouble”.
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He's been under court supervision after pleading guilty to assaulting his then-girlfriend Rihanna in 2009.