I am assuming he will be on some sort of sex offenders register. Ask the elders if they have checked this.
Ask the elders how he can prove his repentance as he is unlikely to have had access to porn or children whilst in prison and therefore his 'works' whilst incarcerated cannot be taken into account. I suspect there will be a 'confidentiality clause' to the answer.
Ask the elders how they are going to be 'protecting' the young ones at the hall before during and after meetings, how will they be protecting them at social gatherings, how will they be protecting children that he will see whilst out on the door to door work.
Ask how many in your hall would like him as a neighbour in the 1,000 year rule before he is made perfect, if the idea makes your skin crawl how would it make a supposedly Loving Father feel, if the holy spirit was truly with the judicial committee then they must have gone against it. (I do not beleive there is a Loving Father or holy spirit)