Per the article : Scouts from three organizations told the Tribune that marijuana was an issue for Brown and that led their teams to remove his name from their draft boards.
But thus far in the rookie minicamp he has stood out . Lovie said of him : "He has stood out in the drills," coach Lovie Smith said. "You notice him. He's slim, athletic, good size, smile on his face and he was a pretty good player in college. However (he went undrafted), we're just glad he's in our camp."