As an accredited referee, you have to be a FIFA qualified referee to ref MLS matches you absolute wombat.
So in short, the MLS uses FIFA referees. Period.
You're absolutely wrong. MLS uses FIFA referee's to Augment their internal association for mentor ship.
I'm an accredited OSA referee. Not FIFA.
Every league has this system. The first leg of the Toronto - Montreal match had this guy
Should have had 10 yellows, and 3 reds that guy never got control during the first leg. Made it impossible to play footy.
Thankfully, European leagues have a higher standard.
Q) I am curious why some PRO referees are wearing FIFA badges and some have PRO badges.
A) There is a pecking order for badge wearing and when a person has been awarded a FIFA badge that takes precedence over any other.
FAQs | PRO - Professional Referee Organization