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Also if they are optically powered with a laser, you'd notice if someone was trying to light it up while it was inside of you. :)

That's just making the job of future archeologists easier :)

On a serious note, the half-life in acidic solutions (which might include stomach acid) is 1 day according to the link shared by perihelions.

They appear to be visible on the edge as stickers. I don't think they are hidden within the rind.