DougCxx postulated:
A truly Orwellian Vision - let us all hope that your prescience never comes to pass. At least not in the USA - I don't really give a hoot about the rest of the world.
Depends on what use you are speaking: as far as "things used against criminal suspects", I would bet eventually there will be stun-gun type devices that work, even from a distance--and without "taser"-style wires. Something that produces a narrow, pointable EMF signal precisely tuned to disrupt muscular control, not the simple electrical shocks that present devices give (-even though they claim otherwise....). When this happens, regular police will give up their duty guns because they won't need them.
---I also will bet that within 50 years the police will be able to track any motor vehicles at all times by GPS, as well as shut them down/lock them/unlock them remotely. The "tracking" part of that future has already begun with OnStar and LoJack, and people pay extra for it because they see having it as an advantage.
---Also I can see great use of networked monitoring systems, as the video cameras in London today, but much more automated--as that system is hugely expensive to operate and of questionable use. Sensors to detect speeding cars, mics that can automatically detect and pinpoint gunshot blasts, cameras that automatically "turn on" when a nearby car or building alarm is set off. Privacy advocates will wail, but most people simply won't argue against this stuff, and it will make a huge difference in many types of crime--but as old crimes decline, new ones will arise.
A truly Orwellian Vision - let us all hope that your prescience never comes to pass. At least not in the USA - I don't really give a hoot about the rest of the world.