On the bright side, isn't it trivial and relatively cheap to make a radio detector of GPS and other such radio transmissions? Or even a signal jammer? Like what

On the bright side, isn't it trivial and relatively cheap to make a radio detector of GPS and other such radio transmissions? Or even a signal jammer? Like what the spies use to sweep a room for listening devices? Let's just assume you're cool with temporarily violating FCC broadcast regulations within a small personal vicinity. GPS jammers can be had for pretty cheap, but I believe they're illegal. Tinfoil works pretty well too. Perhaps, if we're lucky, this situation might just invert, and if total surveillance becomes dirt cheap, then it also means we can watch the watchers. Imagine a Facebook for watching every LE agent in real time across the entire country. The devices for this are already pretty cheap as well (zoombak I believe?), probably illegal to track a LEO as well though.