Terry in the video looked incredibly uncomfortable with it all to say the least, moral qualms aside this doesn't strike me as all that well thought out an idea. I don't think many homeless people would be keen to sign up for a scheme where they beg for money for someone else to decide how its spent and enables their location to be tracked, many of these people actively want to disappear. What happens if the QR code is lost or stolen? It seems to me that it would be a high value target for the lowlifes that prey on the homeless, i can see the codes being nicked and then used to try and obtain money fraudently from whoever is managing it. The homeless are a group who find it hard to prove their identity anyway and impersonating them is probably dead easy. And this is a good point it won't take long for someone to realise this, get themselves a fake QR code and have off with someone's latest smartphone, this only needs to happen 2 or 3 times to undermine the whole scheme.