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Source:
https://www.dhs.gov/sites/default/files/publications/MetalDetectPersonScreen-TN_0709-508.pdf
When like.... 5 seconds on google would clearly demonstrate that phones can and do set off real world detectors all the time.
"Aluminium is a relatively soft, durable, lightweight, ductile and malleable metal..."
Your turn, Stranger... :D
Lighers and phones does not show as metal and drugs does not show as smelly.