R&B singer Chris Brown has tested positive for marijuana - a Los Angeles judge has set a hearing to decide whether he violated his probation stemming from a 2009 assault on then-girlfriend Rihanna.<br/> <br />According to a report presented in court, Brown tested positive in June in his home state of Virginia, where he is fulfilling his community service.<br/> <br />Brown was placed on probation and given six months of community service after pleading guilty to criminal assault for beating Rihanna on the eve of the Grammy awards in 2009.
