Local police reserve units-the volunteer officers who supplement the paid force-are generally well-trained by state standards, a News review has found. Police reserve units were pushed into a negative spotlight last month when 73-year-old Robert Bates, a volunteer sheriff's deputy in Tulsa, Okla., accidentally shot a suspect to death during an arrest while attempting to shock him with a Taser. Questions quickly emerged about the Bates's fitness, training and political ties to the sheriff, and he now faces a manslaughter charge.