I agree. Unwarranted suspicionless surveillance is unconstitutional. End of discussion. To even entertain arguments about efficacy is an implied admission that

I agree. Unwarranted suspicionless surveillance is unconstitutional. End of discussion. To even entertain arguments about efficacy is an implied admission that it might be acceptable if it caught bad guys. Even worse, if all they need to do to sell it, is to show a positive result; you can bet that they will bag themselves some "terrorists" in pretty short order.