Originally Posted by
RobertS975 
The risk to an individual with a life threatening peanut allergy is an anaphylactic allergic reaction which can result in airway obstruction if not promptly treated with epinephrine.
I am NOT a lawyer, but it seems to me that if a passenger were to consume peanuts surreptitiously after being warned by the FA that this was a peanut free flight, and harm resulted to the allergic individual, the passenger could be charged with a crime that resulted in injury to another PLUS the crime of failure to follow crew instructions.
Originally Posted by
gooselee
Also IANAL, but again i suspect this is less about what DL/authorities can do about the pax, and more about DL being able to say they did their part in alerting everyone and thus they (DL) are not liable.
More than concern over liability, I'd say DL has a greater concern about the expense of a flight diversion due to medical emergency.