Members of the Nevada County Sheriff’s Narcotics Task Force ended up arresting six people on drug charges after allegedly witnessing a hand-to-hand drug transaction in front of a Grass Valley restaurant. The task force had a search warrant for Dawn Dereese Medeiros and located her in front of the restaurant in the 200 block of East Main Street at about 11 p.m. Friday, said Deputy John Dzioba. Detectives saw Medeiros and a man identified as Larry Bruce Graham engaged in what they believed to be a drug transaction, Dzioba said. Medeiros was searched and allegedly was found to have “just …