I have to wonder, since one has to be approved as an Unbaptized Publisher™ before they can qualify for Baptism™, this screening process will apply to people who wish to be Baptized™, before they even go through the Baptism Questions™ with the Elders™.
I don't see how it would apply to UBM (Unbelieving Mates™) though. They generally don't participate in the Ministry™ and are not considered Ministers™ or even one of Jehovah's Witnesses, per se; though they do have access to children at Meetings™ and at social functions where children are likely present. Parents likely discourage close contact with UBMs anyway.