superintendent paskt sanchez says they not only have cameras but a sound system that can detect and locate gunshots on campus. but they could use more. >> in a district this size of about 6,000 students personnel alone increase would probably be $3 million. >> plen of companies are happy to help. indiana based allegiance specializes in systems to lock classroom at the first hint hint of trouble. >> our industry is willing to partner with every school in the nation to review capabilities and procedures that help drive awareness and planning for high school security. >> reporter: the industry helps fund a non-profit, the partner aloins for safer schools, which says at the very least schools should consider upgrading lighting windows and doors and cameras. the group says that basic security would cost around $100,000 for a typical grade school, $170,000 for a high school. >> of course the resisting organization is ready with more expensive ideas for any district that asks. even though some other experts say physical security only goes so far. >> it's not just an issue of fortifying the fronts