the ethical question isn't 1) Since when have security personnel been allowed to perform invasive medical procedures - it should be 1) since when have security personnel been QUALIFIED to perform medical procedures. there is a reason why a doctor at a hospital analyses the X-ray images - they are trained for it. how is unqualified security staff supposed to recognize the obvious medical conditions? or any for that matter. analyzing the X-ray images is not a straight forward thing, especially when a person already has an underlying pathology. and also this: "...There would also be exemptions for pregnant women, people with mental impairments and those under 18". great, will they administer pregnancy tests as well? sexually active women may be in early stages of pregnancy and not know it yet. and that is the worst time for a unnecessary X-ray.

Having an implanted artificial heart is not without risks - the infection of artificial material and thrombosis of various organs (depending n the type of device) being the most dangerous and possibly fatal. when she needed it to survive, the risks of having an implant outweigh the risks of adverse effects. now it is probably the reverse, so the removal seems sensible. she is a very very lucky girl, good luck to her.