The metal detector can also pick up plastic and/or gel I believe.
Back in September of this year I had trouble taking a 2oz. tube of hydrocortisone through security. It was in gel form and just in a little plastic container, no metal. I stuck it in my pocket thinking I could get away with it. Nope, busted. The walk-through metal detector found it, and then I got set aside and wanded. The wand picked it up too. I wasn't allowed to take it with me.
Head --
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