The term "Qualified Persons" is defined by the state or juristiction you live in, the exact terminology shall be convoluted in direct proportion to the amount of (or lack of) bureaucracy responsive to said locale.
The legislation of the latter is equative of those who lobby for loose restrictions vs. the statistical morbidity and mortality of so called "Qualified Persons" . So it is in the "Home Depot, Time Life" mentality of todays market. -------------Sparky