Can metal detectors detect caps of alcohol bottles, even palm-sized ones? Metal detectors can detect metal caps of alcohol bottles, including palm-sized ones, depending on the sensitivity of the detector and the composition of the cap.
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This can be done by hiding items in specially made pockets or pouches or even sewing them into your clothing. Another method is known as “metal shielding.” This involves wrapping metal objects in a material that doesn't trigger the detector, such as aluminum foil.
In addition to visual evidence, hotels rely on their sense of smell to detect vaping. Vaping produces a distinct odor that can linger in the air and on fabrics. Housekeeping staff are trained to recognize this scent and pinpoint its source.