They are using old police radar so very likely it's Ka. Would be pointless if they weren't as that's all most RD user's look out for. What would make it illegal? Someone commented in one of the articles about it being illegal due to it being a breech in the FCC. Can't remember the exact wording but something to do with deliberate interference.
That would not hold up though for the same reason it's legal to use a radar jammer.
EDIT: Definitely Ka band. Dude on the news had his V1 go off and it was showing Ka. Then again they showed a LIDAR gun when referring to radar so who know's if the footage was from that.
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