The major problem with the airline security industry is the sheer inconsistency of its approach. SWMBO has two replacement knees, with 500g of titanium in each knee. As a result, she gets taken aside without fail every time when going through security.
The security treatment from that point on, varies from a chat with a cursory inspection - to the full-blown, abrasive, ignorant power-wielder ar$ehole, who treats her like a convicted known terrorist, and who virtually explores every body orifice in detail, over 5 minutes or more.
It's time a standard approach was taken every time - not one just based on the individual security persons interpretation of the situation.
As the number of replacement joint operations increase (there's already around 80,000 knee replacements alone every year in Oz as I understand) to the many hundreds of thousands annually - in line with ageing populations - then this angle is going to have a very sizeable impact on slowing down security operations in the future.