These are absolutely going to start showing up at protests.
The company making it.
https://www.ghostrobotics.io/about
The first Air National Guard base to get one.
https://www.af.mil/News/Article-Display/Article/3002329/robot-dog-reports-for-duty/
Asking out of pure scientific curiosity, is it possible to electrify a field of very fine metallic chaff?
Wait what am I thinking, water is the obvious low tech answer here
water loaded with dissolved ions for conductivity, I.E. saltwater
EDIT: in all likelihood these will be built to pretty good IP water resistance ratings so don’t count on breaking them by simply splashing them. a pool of electrified conductive water might work though.