Get yourself a sports bra. You can stash so much stuff in one of those. Phone..cash...drugs. Cops never think to frisk that area unless you're wearing a shirt with chest pockets. Plus you can wear a metal necklace when you walk thru. If they wand your chest, pull the necklace out from under your shirt. They aren't going to stop to think 'is he wearing a bra with stuff inside it?'.
i seen some where that taking a knife a placing it in one of the hallow metal handles of a suit case allows small metal objects to go threw scanners and xrays un seen
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Also, couldn't you get a friend to bring it in for you during visiting hours?
Long Answer: Maybe if the metal detector is cheap or not very powerful, but probably not.