Unfortunately if you're captured, there's nothing to stop your captors from scanning you multiple times on a regular basis. Which, if it's been established that you are a credible threat (shadowrunners), a halfway decent security department will do. Hell, some holding cells might just have built in scanners running continuously.
At that point it's merely a matter of time before you are found out. The only variation is your mean time to failure.
It is better to just assume that you are just screwed as far as gear goes. Best plan for an exit strategy that only involves your mind, your noodle, the ol' grey matter. It is, after all, the best weapon.
Ideally part of this plan involves pre-arranged outside (or inside) help.
-k
(Old Man Jones was captured once. Once. It didn't end well for his captors.)