For instance, I went into a doctors office and on the counter it had a notice stating that if your bmi was over 35 they are regulated to make you go get tested for sleep apnea to maintain your class a drivers license. On the contrary congress passed a law stating they couldn't force them to get this test due to bmi alone. There had to be other indicators such as high bp, excessive snoring, etc.
I suspect the law being referred to is HIPPA, which most certainly not black and white.
To that end insurance carriers have considerably influence in this regard as does the lay public bc those whom are "overweight" are at increased risk for SA and could fall asleep behind the wheel driving an 18 wheeler.
A patients rights under HIPPA has limits especially if non-disclosure poses a greater risk to the lay public.