My wife & I have encountered similar treatment with our scuba gear over the years taking our own personal equipment we know has been maintained instead of depending on rental gear that it's anybody's guess on when it was last torn down and soft parts replaced in far flung destinations, both from airline staff and TSA agents. Keeping our regulator and instrument sets which are truly life support equipment in our carryon luggage is instrumental to minimizing risks of damage or theft. Miami airport was a hotbed of inside ring theft of scuba gear and underwater cameras in particular. Once TSA kept claiming my wife's scuba mask was testing positive for explosive material and we waited the better part of an hour for a supervisor to appear who simply turned it over in her hands to then declare it was OK. Other times we've been told silly stuff that the instrument consoles on our regulators were potential bludgeons, again a supervisor was required to clear things up. We had printouts from the TSA web site and airline web site with us when these individual interpretations of published written policy occurred. We simply factor in that here in the USA we'll be pulled over as soon as our carryons go through the bag screening and know to request a supervisor if things get contentious as well as a printout of the surprise info. As noted all such individuals were way less than pleasant to deal with especially after being challenged on their decrees. Then silent after their snap judgements were overridden. It helps to request a written / printed statement delineating the surprise statement both before and after arrival of a supervisor. Notably, the biggest hassles are when leaving the US. When traveling between such destinations or teturning to the US, the airport folks are quite knowledgeable on such specialty items and policies regarding them, and don't have a personal stake in hassling you because they want your tourism monies to return to their destination. When honest mistakes have occurred they were able to be swiftly and courteously corrected with smiles and an apology. Our domestic airport personnel could take some lessons from folks at travel destinations but I don't honestly think it would help unfortunately.