The Memphis school board's policy committee is looking at increasing the frequency of metal detector screenings in secondary schools. Staffers are proposing that schools be required to do one search each week--either a school-wide metal detector screening or a random search in a classroom or other school room. Last year, the district looked into the feasibility of daily screenings in every Memphis middle and high school after high school shooting. Administrators determined it would cost $4.5 million to do daily screenings.