This report provides information on the causes and incidence of youth violence and summarizes violence prevention strategies used in schools across the country. Particular attention is devoted to the use of metal detectors in schools. It would cost an estimated $32.5 million to implement a metal detection program in all of the District's schools. Disadvantages of metal detectors and issues districts should consider when deciding whether or not to use them are summarized. Programs and policies that can provide an alternative to or supplement the use of metal detectors are also reviewed. It was concluded that no single security system can guarantee that school violence will be completely eliminated. Research shows that the implementation of early violence prevention and social skills programs and the establishment of trusting relationships between staff and students can increase safety in schools. (Contains 2 tables and 2 figures.)