in the harry potter books, how to azkaban escapees such as sirius black and bellatrix lestrange get their wands back? the prisoners must get their wands taken away, or maybe even more destroyed, as they were going to do to harry's after he produced the patronus in book 5; because they are prisoners and could use their wands to actually help escape... so how do they get them back and are able to use them, for example, to do the killingg curse(as lestrange did to sirius)...?