Enough power and they could jam all communications
The problem with this, however, is that they won't know which cars are liberty activists and which aren't. A cop car with a jamming device driving down the highway is going to cause all kinds of havoc; cell interruptions, wifi, satellite, cordless phones, etc depending on which bands they are targeting.
Not only that, but the cost of outfitting patrol cars with jamming equipment means they need humvees (where would they put a jamming device powerful enough on a cruiser?) and the gear itself would be more expense on an already fragile budget. What would the payoff be? Not having a cop be suspended with pay once in awhile for stepping over the line?
Or UAV's with sniper rifles plinking off cops
I hope that would not be the case. I rather want to see cops plinking off cops as they fight over jurisdictional 'turf' when the monetary system implodes.
Direct resistance against the state only makes it stronger in the minds of its supporters; justification to stomp people's rights. Redirected Resistance that exploits contradictions in statism (especially them using power in corrupt ways by setting up 'honey' traps for state officials) weakens the myth of state power.
If we want the state to go away, people have to stop believing in it.