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He recently began accepting payments through a credit card reader for the first time.

The worker presumably slipped your card into a bogus card reader and charged you $1,500 just as you were rushing to return your rental car and catch a flight out of the country, knowing you were unlikely to report the crime to Mexican authorities.

Professor Frank Marken, lead author of the study at the University of Bath, said: "Just as your contactless credit card doesn't need an external power source to work because the proximity of the card reader is enough to power it -- in a similar way, this sensor could create a small, measurable electrical current when lactate binds to it."

Sydney took a deep breath and pressed the ID against the electronic card reader.

Once again Sydney held her breath as she pressed the ID against the card reader, and once again they were rewarded with the click of a door unlocking.