In one congregation there was a man who was an active drug user, had unconfessed adultery, and was being prosecuted for tax fraud. After several years of active opposition to his JW wife the man decided to get baptized. The elders took him through the questions. The wife told the elders exactly what his status as a drug user was, and about the criminal charges; she didn't know about the adultery (yet). The elders postponed the baptism.
The man left his family and moved into another circuit a few miles away from his family (big city, lots of circuits). There he attended meetings for a month and asked to be baptized. The elders were aware of his family situation and the wife made these elders aware of his personal situation. These elders decided to go allow the baptism to proceed.
A month later he confessed to the adultery and admitted that his wife had been telling the truth about his drug use and criminal activity.
Did they annul or reverse his baptism? Nope. They browbeat the wife.
Six months later they disfellowshipped the "brother". He tried to appeal the discellowshipping on the grounds that his baptism was invalid. It didn't work, they said his baptism was valid because he knew what he was doing at the time he went through the questions.
Mind-boggling.