I'd read somewhere a few months back that FIFA had asked its refs to ask players if they see a possible handball but aren't personally sure, spurred by Thierry'

I'd read somewhere a few months back that FIFA had asked its refs to ask players if they see a possible handball but aren't personally sure, spurred by Thierry's uncalled handball against Ireland (the one that caused all of the outrage a while ago because it kept Ireland out of the World Cup), which Thierry freely admitted to. I think the hope was that most players would be honest in that situation (since it's pretty clear-cut to them and upon replays).