Wireless interference with emergency radios?

This story in the Washington Post about problems with emergency frequencies strikes me as suspicious, as it is either about empowering the FCC or giving private industry more spectrum or spending more local government money, or all three. The odd part is that it says that Montgomery County, MD, "took care to ensure there wouldn't be any interference problems" with its new system, and has no problems, so why isn't the question what's wrong with the other government systems?