Code, it's not APCO25, it's a Mototrbo system.
MOTOTRBO - The RadioReference Wiki
No scanners can natively monitor it at the present, you'll need a scanner with a discriminator tap, and you have to run the discriminator audio through a Linux PC application to decode speech. Mototrbo was originally designed for business communications, but it has recently gained popularity in public service applications, because of the pending FCC mandate for all systems to be narrowband before 2013, and the cost of Mototrbo is significantly less than APCO25.
On the plus side at least, Mototrbo isn't encrypted or particularly CPU-intensive to decode, so hopefully it can be added to digital scanners with a firmware update soon. The biggest hurdle keeping it from happening--it's a proprietary format owned by Motorola, so it looks like we won't see it in scanners until the manufacturers cough up some licensing money.