This article is from the Piercing FAQ, by Anne Greenblatt with numerous contributions by others.
Security metal detectors are used to detect certain types of metal
which may be part of a weapon, firearm or bomb. The metals used for
body jewelry are usually not detected. Very few people have reported
setting off security metal detectors, and in these instances they had
been visiting a country with very high international border
security. Others have commented that the secondary handheld detectors
did not react to their body jewelry.
 
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