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”.

He's been under court supervision after pleading guilty to assaulting his then-girlfriend Rihanna in 2009.