It may be up to an LEO to determine that fact, but it is NOT up to the screener to report it. Using your "logic", the screener has already made a determination that carrying a large sum of cash is suspicious.

Since the TSA has been unable to hire screeners capable of determining 1" of thickness, I seriously doubt its capabilities to hire screeners capable of determining anything suspicious.

A Screeners job is to look for threats to an aircraft, PERIOD. Cash is not a threat to an aircraft. Sounds to me that not only were these morons wanabee cops, but they were envious that someone had that much cash to carry with them.