It won't be long before you won't be able to listen to police activities on your scanner.  Fort Collins Police Services plan to switch to encrypted radios over the coming months.
According to the Fort Collins Coloradoan:

Fort Collins Police Chief John Hutto said the gas station robbery is an example of why the public shouldn’t be able to tune in to the police radio stream. For Medina and his fellow listeners, the red light turned green, and their bus continued on its route. But Hutto said other curious listeners might have been drawn into a potentially dangerous situation.

Within the next two years, new equipment will allow police to encrypt transmissions.  The move is designed to protect citizens’ private information and the security of police operations.  Chief Hutto says there will be no added cost to taxpayers.

The department hasn’t yet decided how many channels will be encrypted.