Michael Voris has hit the nail on the head and has come up with a question of extreme simplicity that will allow anyone to instantly discern the orthodoxy of any clergy, religious or layperson. The question is:

“Do you desire that everyone in the world be Catholic? Yes or no.”

If the answer you get is anything other than an instantaneous, emphatic, and unqualified YES, then there is a massive, massive problem and all future dealings with that person should be addressed and parsed with the full knowledge that the person is NOT properly catechized at best, or a heretic or apostate at worst.

No matter who it is.

NO.
MATTER.
WHO.
IT.
IS.

I would encourage one and all to start asking this question. Frequently.

Spes Unica.