Do you;
- Have a radio that is P25 capable, trunking capable, and in the correct band you wish to scan?
- Have the appropriate software and cables to program it?
- The knowledge to
properly set up a non-affiliate scan?
If you answered yes to all of the above then, you could attempt such a thing.
If not, every other reply to this thread will likely be telling you to go buy a scanner instead.
Also worth reading before making any more posts about the topic:
Do you want to monitor a Trunked system with a Moto? Read This!