Also to clarify, Pretty much all but the latest models of commercial radios are available on E-bay, and you don't have to be a Public Safety person of any kind to own them. Its the access to the network that is the key. Remember that if you do not work for an agency, or have written permission to access a radio network using gear that is made to actively access it (AKA Actual Radios, scanners do not actively access a system, they only recieve it), then accessing that system is illegal. And if you do get caught monitoring said system using actual radio, that gives them all the justification they need to turn on encryption to prevent said illegal access of their network. Yes I know, there will be a million replies to this that its your right to hear em etc... Bogus Salami.
Otherwise, have fun, stay safe, and enjoy!