VStall has not missed the point - his advice is v. pertinent.
It is the act of driving whilst fatigued that the court will investigate - not the causes of the fatigue. Crewing did not crash the car - the driver did.
The driver (killer) would be branded a pariah forever, though the inevitable sentence might be reduced by a sucessful plea of mitigation.
Such pleas need not include :
1. We like living in Cornwall
2. Hotels are so expensive
3. My social life is in ruins
4. Tee off was brought forward
5. Everybody else does it
6. Life is unfair
Please don't assume I'm moralising - the very nature of our job involves risk management. Just agreeing with VStall that on the day of reckoning it will be the driver on trial not the Chief Pilot.