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I guess it won't be long before the delivery drivers will be wearing body cameras so they can provide footage of the person who signed for it, or evidence it was left somewhere as requested, if needed.
I've been suggested this or similar for ages - it would seem to be straightforward tech to adapt the PDA type thingys to allow a photo (of the person, or drop off location) rather than the ridiculous scrawl that passes for a signature.
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