I am not sure. The only district in Somerset County that I know maintains trunked radios is Franklin Township Public Schools, but those are limited to the Franklin Township TRS. SchoolSAFE sort of idea, except they have the direct P25 access. Schools only use the system for emergencies or communication with FTPD; otherwise, just an average professional radio. What does that look like? Unknown. Have yet to see it. Perhaps it'll be more informative when the switch happens.
SROs stick to their assigned primary TGs or local PD frequency for the non-TRS municipalities, so this is not for them. When disaster strikes like the Watchung Hills HS incident last year, Countywide PD is the common LE denominator. Warren PD should have enough radios now to not commit war crimes of patching analog into P25 through a receiver in Somerville... if you listened to this event from the TRS side, you may be entitled to financial compensation.