Many of your rights as an American citizen, as listed in the Bill of Rights, are for practical purposes at an end. Gratuitous warrantless surveillance is now a technologically realistic possibility; who's to stop your government from watching you?
As I think about the history of various new weapons, I can't help wondering if these technologies have some inherent vulnerabilities to simple, inexpensive countermeasures that will reduce their usefulness to police departments or at least make them very expensive to operate. Pebbles from pocket sling-shots or pea-shooters come to mind. Legal prohibitions against such countermeasures seem to me less than clearly sustainable in the face of people's Fourth Amendment right to be "secure in their persons... against unreasonable searches...", but IANAL. I don't know how much such defenses would be reality and how much fantasy, but it seems to me worth contemplating the possibilities: what are your privacy rights worth to you?