The security of many countries is being threatened from sources within and outside of their borders. For the lawman, having the right tools in his crime fighting arsenal is often critical to an operation's success. Today, a new set of high tech tools help law enforcement agents perform underwater searches safer, and more effectively, than ever before. In their investigative operations police routinely search for weapons used in the commission of crimes, hunt for drowning victims, and survey underwater structures looking for smuggled goods or explosives. For the police diver, one of his most effective weapons is the underwater metal detector. Used in evidence recovery operations, these detectors have been directly responsible for putting many criminals behind bars.