zlacker

>>eloran+(OP)
Most of our local departments use encrypted radios.

"Over the past few years, an increasing number of municipalities and police departments, including the District’s, have begun encrypting their radioed communications.."[1.]

https://www.washingtonpost.com/local/social-issues/last-of-t...

>>Simula+s7
Completely outside of my area of expertise, so this may be a silly question, but are police transmissions distinguishable from others in their encrypted form? If so, there could still be a use case for knowing _where_ the cops are. Wonder if some sort of mesh could be used to triangulate the positions of these signals.

>>dmkolo+1b
Often they are, yes. It’s relatively easy to use an USRP to generate alerts when someone is using TETRA nearby.

But sure, other agencies may generate false positivies.