Also, robbers would know there is such thing as a "help" pin, therefore renderin... | Hacker News

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jmonegro on Jan 5, 2012 | parent | context | favorite | on: Why Don’t Smartphones Have A “Guest Mode”?

Also, robbers would know there is such thing as a "help" pin, therefore rendering it useless. It's not a good idea in practice.

Angostura on Jan 5, 2012 [–]

It wouldn't render it useless if the behaviour of the machine was identical (other that sending a silent alert) and still dispensed the cash.

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