The night one is appointed as an elder, two elders simply meet with him in the back room and ask him if there is any reason why he shouldn't be appointed. No question is asked regarding former child molestation, etc. The 'encounter' takes all of two minutes.
Technically, the 2001 KM School instructed elders to do this 45 minutes before the beginning of the Ministry School the night he is appointed to speak with him at length about his 'new role', but in practice, this seldom happens.