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Great idea, maybe a guillotine style thing above the door attached to a sensor which, when someone comes along who hasn't washed their hands, the fucker comes down and cuts them in half lengthwise. Then some AI bots can come and clean up the mess as I'm sure there'll be so many meat sacks piling up.

Crikey, looks like I chose exactly the right man as my chief executioner!:)

You did, my CV is pretty solid.