One knwn trick is to keep the person's foot in a bucket of ice water so it cannot sweat. Since the bracelet reads the chemicals coming off the person's perspiration, if he has no perspiration, no chemicals are being released. According to at least one probation officer, the bracelet registers a different reading if it is tampered with, but the ice water will not produce that reading of tampering.
Another rumored way is to insert cold deli meat between leg and bracelet. However, this method risks registering a different reading than his normal reading, which may prompt the probation department to call him in for an alcohol test.
Once the bracelet has the chemical information from the skin, the bracelet transmits the registered readings to the device that is plugged into your friend's home phone. Apparently, the ankle bracelet can keep three days maximum readings on it before it erases and starts over again. Your friend could go to a friends house, drink alcohol, and wait the three days before coming home. By then the information that has his alcohol readings will be recorded over because it only stores for 3 days, and he was not near his phone to download the inculpatory information. However, ususally it is required that the wearer a daily amount of time near the home phone so a download can occur each day - so by avoiding that, he could be getting himself in hot water for that reason.
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