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Old 08-09-2009, 09:39 AM
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Dave Dave is offline
Join Date: Dec 2005
Location: Alabama
Posts: 18,001
Sometimes my wife alarms the metal detector (plate and screws in arm) and other times not. I have no metal other than fillings yet I set off the detector at Heathrow last week. Often, something subtle in the immediate area can affect the metal detector, such as too many people being in the vicinity. It essentially increases the background "noise" and can reduce the alarm threshold.