Will a hand warmer set off a courthouse metal detector?
Hand warmers typically contain iron powder, which can trigger a metal detector if it is sensitive enough to detect small amounts of metal. However, most courthouse metal detectors are set to a specific threshold to avoid false alarms from common items like keys or coins. It is unlikely that a hand warmer would set off a courthouse metal detector unless it contains a significant amount of metal or the detector is set to a very high sensitivity level.