WB PD Channel 2 encryption

[ra7850]

This morning I heard Wilkes-Barre PD channel 2 being used with encryption. Has anyone heard this channel being encrypted before? The transmissions immediately before and after weren't encrypted so it seems like it's something that can be done on a per transmission basis.

154.80000 WPKW723 RM 146.2 PL WB City PD 2 Wilkes Barre Police 2

Robert