Thomas: This is from R.O.P.E. And I quote "Rapping the table with your hand or using any other gesture that normally interpreted as a pass is considered a 'Check'. Verbal declarations of 'Check' or 'Pass' are binding." I also find it interesting that you never chimed in when I was "in a state of shock" at the 2011 Summit when the word "pass" was not recognized as Official Poker Terminology. 
The word "Pass" not being recognized is still surprising to me. I remember the discussion of official terminology, but I was not there for either Summit 2011 or 2013 when the actual votes and official TDA stances were adopted. I was only able to attend Day 1 of each and give input. A definite flaw in the system.
Thanks for bringing up the R.O.P.E., I figured someone had written it somewhere

I've been meaning to write a 2nd edition for some time, but so much has changed and things continue to evolve and life gets in the way too.
Like I said, I'm neither for, nor against the idea. I also get told a lot of times that we don't use the McGee Rules of Poker around here..... lol.

I know I'm not alone when I say I'd like to see the TDA rule set more streamlined and focus on fixing the broken rules instead of adding rules to the rule set that we really have no concrete answers for. Even this topic can be subject to "iffy" unless you use language that uses the wording of "any and gestures that may be interpreted as a check" will be binding. Then add Gestures to the official terminology or glossary (if there is one).