Loophole?  So the chairs can magically accommodate more weight than the amount the manufacturer rated them for if the person sitting in them achieved this weight due to a medical condition? If the chair breaks and the offending 250+ blob is injured, does it's medical condition make the salon any less liable? I  2000  f a hospital doesn't have an MRI machine that can fit you, you have to go somewhere else.  That somewhere else may be a zoo, but such is life.  The hospital isn't required to go buy a Whaletron 3000 MRI machine for that 1-in-5000th patient.  Why would a nail salon be held to a higher standard than a hospital?