That's my issue, you shouldn't have to "poll a card" to make a ruling.
The USGA has made it a point in their rule making to try to eliminate ambiguity and subjectivity from the rules. The reason being that the sport is for the most part self officiated by the players. Outside of the highest echelons of tournament play, you do not have an official on every hole that can see events as they unfold. It's important that the rules are clear and unambiguous, so that every player that sees something, sees the same thing.
Given the fact that disc golf is similarly self officiated, I think the PDGA should strive to do the same and eliminate as much ambiguity and subjectivity as possible.
Just in this example, wouldn't it be much easier for a TD to walk up to card and say:
"Did the disc move after he reached and marked it?"
rather than
"Do you think the wind maybe caused it to move a bit, or do you think that it moved of it's own accord, how about you, what do you think?"