You make a strong case for certain points here and I don't dismiss them. But I also think several points are blurred. That is perhaps inevitable and that is the

You make a strong case for certain points here and I don't dismiss them. But I also think several points are blurred. That is perhaps inevitable and that is the point I am making. for example (1) That doesn't change the essential characteristic of whether it's your data, or data about you. The datacard in my FLIR camera is (a) my data; and (b) about you. Neither of these qualifications are insurmountable. The courts have not tripped over this technicality, because the <purpose> of using the FLIR instrument is not considered a reasonable use of technology, when it has the impact of making surveilance <unavoidable> per-se. (2) The post office example. This raises two issues: (a) technology; and (b) scale. Mail by post is distinct from verbal speech and generates metadata because of the need to address an envelope. Its low technology, but this is an artifact of the technology. With respect to scale, what is 'reasonably' to collect is a function of resource expenditure. As the cost of collection decreases, the amount of data 'reasonably' collected <increases>. But that is beside the point of where my <reasonable expectation of privacy> has changed or stayed the same. (3) Scale, generally speaking. eg: Technology makes it easier to collect metadata, but it does not turn "data" into "metadata." The express purpose of the meta-data programs is to turn <meta> data into <data>. This is sort of the fundamental question at the heart of the matter, from a constitutional perspective. The purpose of these systems is to surveil beyond the scope of what would normally be perceived as reasonable. In that regard, it is aking to using FLIR to make surveilance <unavoidable per-se>. Or at least that is an argument which should be ajudicated. Perhaps by legislation, as well, once a more coherent framework has been set forth by the courts. In otherwords, now that these 'edge cases' are being swept up into the norm.