I have a close friend who had his baptism anulled in the 1980's. He was very young when he got baptized, about 12 and he soon afterwards committed some petty crimes that were known in the neighborhood. He was sentenced to reform school and before he was shipped off, the brothers meet with him and made an official announcement that his bapitism was null and void.
I always thought that this was done more for the sake of protecting the congo from a bad reputation in the neighborhood than for the benefit of my friend.
Unfortunately, after he came out of reform school after about a year he got rebaptized and is currently an active witless, although he does not adhere to most of the dogma of the witlesses.
He only does the minimum and has many "worldly" habits. His view is that he likes the social aspect of being a witless and does not want to give that up.