The scenario: you’re in a bar, enjoying a boozy evening out with friends. Your mobile rings. It’s a real emergency: if you don’t hustle, someone will die. Maybe you’re the only available pilot, maybe you’re the only available computer technician. A self-test kit has recently confirmed that you’re only modestly over the legal limit, but you’re over the limit nonetheless. You communicate this to the other party. They insist. Who assumes responsibility?
Does it depend upon who calls you?
Does it depend upon the degree of the incident for which you were called out?
Does it depend upon the degree of the incident during the call-out that may have been because of your lack of sobriety?
Nuance this further as you desire to enlighten Dopers.
A Sheriff goes into the bar and needs help chasing the kidnapper of a little boy.
You’re a medevac pilot and off-shift. The other pilots have gone down with food poisoning. If you don’t fly, the patient will die.
A ship has gone down. The weather is bad and your plane is the only plane available capable of flying in such conditions.
You run a red light.
While driving at 140 delivering a transplant organ you crash into a house.
You run over someone, killing them.
While your plane is taxiing to land after a [successful / unsuccessful] rescue you chew someone up with a propeller.
During the rescue process, you land your seaplane atop a life-raft, killing all aboard.
Add as you feel fit.
Please note that this is GQ - if I wanted to ask if you would ignore sobriety laws, or convict someone who ignored sobriety laws in such circumstances, I would have put this in IMHO.