I know that the London, Ontario system of the late 90's was encripted, and aside from finding a dealer to sell you the same radio as the system was using, and programming it for you, you were out of luck. (They would just disapble the transimt in the radio) Unless you know of a good shop that can do this, you would remain out of luck.
My best advice is to find an antenna festooned tow truck in the are and ask them what they have or if it is possible to get the Niagara police.. they seem to know if it is possible, even though it may be too costly for the average scanning enthusiast.