To find out what kind of surveillance tech you may be facing at a protest, check out EFF’s Atlas of Surveillance: https://www.atlasofsurveillance.org/.
Atlas of Surveillance
Documenting Police Tech in Our Communities with Open Source Research
You can also watch this video from EFF’s Dave Maass on How to Observe Police Surveillance at Protests: https://www.youtube.com/watch?v=oGscYgR7bXc. Let us know what you see out there by emailing [email protected] with "Protest Surveillance" in the subject!
@eff Nice. Another survilance map was started 2016 and due to it being a single person project was close to be shut down. But the Chaos Computer Club Hamburg took it under its wings. https://sunders.hamburg.ccc.de/ A third such map, specialized in flock readers is this one: https://deflock.me/map