The problem is the practical difficulty of inspecting enough faces.

BBC: Doppelganger: Desperately seeking my lookalike

In any event, there is another practical difficulty.

CNN: HOLD TO THE COMMON LAW

With tools like NFCProxy making contactless card fraud more practical all the time, that difficulty is starting to seem like less of a safeguard.

FORBES: Connect

As a long-standing proponent of marketing integration I can speak to the fact that many marketers still have difficulty in putting it into practical use, including many chief marketing officers which was the basis of my piece aptly titled The Eleven Letter Word That Continues To Elude All CMOs And Marketers.

FORBES: When It Comes To Mobile Marketing, Integration Is Key