How’s this for a snack-time quandary: Doritos, Snickers, or methadone? The synthetic opiate is commonly used to quash the cravings of heroin junkies, but dispensing the stuff involves red tape, and there’s always the risk that human error will lead to an overdose. So prisons in the UK are turning the task over to vending machines. Automated dispensers scan the fingerprints or irises of preauthorized cons, then squirt an individualized dose of the syrupy goo into a plastic cup.

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