No problem with the concerns but if Amazon does not sell it, then someone else will sell it or sell another version that might be better or worse. It is obvious this technology is going to spread all over. And what about selling it to airports, train and bus stations? What about selling it to schools and universities? This technology cannot even be banned by law because in our globalized world there will always be some black market traffickers who will provide it to anyone who is able to pay for it. We should also ban DNA and fingerprints technologies, along this very line.