Hello & welcome to RR! If these are the channels you are monitoring, they are listed as analog FM on the RRDB:
158.73000 156.03000
KNBJ654 RM210.7 PLYPD 1Youngstown PD Ch. 1 FM Law Dispatch
158.79000 155.19000
KNBJ651 RM173.8 PLYPD 2Youngstown PD Ch. 2 FM Law Tac
If they were encrypted they'd most likely be listed as such in plain text next to the channel description or if you are monitoring a trunked radio system the letters "DE" would appear under the "Mode" field of the talkgroup to indicate "Digital Encrypted". Hope this helps