"A left-handed individual was more likely to sustain an amputation both at home and at work. The left-handed were more likely to have a dominant hand amputation than were the right-handed (70% compared with 51%). These data suggest that left-handers have an amputation risk factor 4.9 times greater than that of right-handed people."
These were taken from "Is being left-handed a handicap? The short and useless answer is yes and no."
Maybe they need to add a question to the shop test:
_____ I am left handed. 1) True 2) False
1 is disqualification.