The R&B singer tested positive for marijuana in June in his home state of Virginia, where he is fulfilling his community service.
Brown, who is midway through a five-year probation sentence, produced a medical marijuana card after the positive test.
The LA judge said mandatory drug testing was not a condition of his probation but she scheduled a November 1 hearing to decide whether he had violated his probation on that and other matters, including travel restrictions and fulfilment of his community service.
Brown, 23, was given a warning in court, reminding him that he was a role model.
"You are not an ordinary person who can sit in your living room and do whatever you want to do," Superior Court Judge Patricia Schnegg told the Turn Up the Music singer.
"More importantly, a lot of people look up to you, a lot of kids. What you do and what you say impacts a lot of people."
Brown's lawyer Mark Geragos said his client had "completed all of his community service".
"First, the initial process we started off we had a lot of media and TV," explained Brown, when responding to questions about his time spent doing community service.
"After we started getting into it more, they started making the cameras leave. That is how I was by myself most of the time."
Brown, who won a Grammy award earlier this year, was sentenced to five years of probation and six months of community service after pleading guilty to criminal assault for beating Rihanna on the eve of the Grammy awards in 2009.
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