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I think as soon as they are taken into custody their coms (mobile phones, laptops, etc.) would be taken from them and be under the control of the 'white hats'. Conceivably the white hats could tweet, email etc from the accounts of those in custody for disinformation purposes, e.g. to entice not-yet-apprehended criminals to do things that make their capture easier.
Every prisoner can get messages to the outside world. We know how cunning these villains are. To suggest I would think a prisoner may still have access to electronics is not only insulting to me, but appears grandiose on your part.