Last April, when tornadoes were threatening Jackson, Mississippi, many residents were not alerted to the severe weather because five tornado warning sirens didn't work. The reason: the sirens' copper wiring had been stolen.

A month earlier in Polk County, Florida, nearly 4,000 residents were left without power after thieves stripped copper wire from a transformer at an electric company facility. Estimated losses: $500,000. Not to mention the homeowner hassles.

And late last year, vandals removed 300 feet of copper wire from a Federal aviation Administration tower in Ohio, threatening to interrupt communications between in-flight aircraft and air traffic controllers.