The rule that has been quoted here a couple of times says that discs cannot be tested ABOVE 77 degrees- i.e. you can't perform the test at a temp so hot that your disc is half melting. A lot of you seem to have read that wrong and gotten the opposite impression. Also, I didn't see any mention of a TD being able to test a disc during a tourney, the quoted rule indicates this type of testing should be performed on a disc mold to ensure the legality of that mold, not on individual discs. All of you saying how this rule would be unenforceable seem to have missed that point as well. Sorry for sounding douchey, but I think if people understand the rule a bit better they may revise their opinions.
The issue comes to the fact that another rule has put in place this year that if someone challenges the legality of your disc, it has to be approved by the TD. Thus if they say "Your firebird is too stiff" then you risk using it the rest of the round, getting disqualified if the TD declares it illegal. or not using it, and potentially shooting worse without one of your discs, to avoid any potential DQ.
All we really want is for the PDGA to clarify what it means when they disallow a company to sell a specific disc(as approved), and what the legality of using a previously approved disc is that potentially could be against the stiffness rules.