The much more difficult question (or not difficult question depending on who you ask) is whether a system like this should exist even if it has perfect accuracy.
At what point does the tracking of individuals cross privacy lines and become oppressive? Scraping internet browsing habits? Automated traffic cameras? Mandatory facial screening?
That is the real question and unfortunately it's not one that can be grounded empirically (at least as far as I have seen).
One thing is for sure: we have been headed down a dangerous road for awhile. Washington seemingly wants to go down it seeing as Presidents from both sides of the aisle have only rolled us further down this road.
Edit: I used Washington here because I am a US citizen, but I think it worth pointing out that other developed nations have been going this way as well (e.g. the UK).