I live near one of the Army's chemical weapons disposal sites, and the federal EMA replaced ALL local law enforcement and emergency response agency radio systems with a central trunked and encrypted system. No scanner will receive and decrypt those signals. It is important to find out what kind of system your local agencies operate and if a scanner is going to be able to receive their transmissions.
Oh yes, and thanks to all you good taxpayers for helping pay for this $30-million federal boondoggle radio system.