1) If you have a personally owned radio on the Suffolk trunked system, and it affiliates with the system, that is illegal. The system will kill the radio.
2) If you have a department owned and issued radio, which the County has already programmed, then your department needs to make a formal request to reprogram the radio.
3) Are you seeking to monitor the PD's channel, through non-affiliated monitoring? If you want to non-affiliate monitor, that you can do, but as soon as you affiliate, you are violating the law.
4) If your radio affiliates with the system, yes, the SCPD can see who is listening and kill the radio. If your radio is not affiliated with the system and is just "scanning" then they can't see you listening and can't kill the radio.
Can you please clarify?