Without re-reading, I'm pretty sure she knew she had some meatbolic disorder. She'd had a hypoglycaemic incident before.
I'm responding here to 'deliberately impaired'. So my daughter goes driving and she doens't know she's oging to have a seizure but she knows she had seizures fewer than 6 months ago. Is there a moral problem with that?
I am NOT saying a person with diabetes is exactly similar. Far from it. I'm wondering, just wondering, about a threshold for LIKELIHOOD of suddenly losing the ability to control a vehicle. I think it's agreed that the threshold is higher than "deliberate impairment", and I think that's acceptable. I just wonder how much higher it should be and how we decide.
On second thought I kind of like it. "I used to have a meatbolic disorder, but then I quit eating Italian food." It works!