And since it is an illegal drug with known ill effects, that the pilot chose to consume of his own free will, then it is the cause.
We see meth users on freeways occasionally, they are the ones travelling 30-40kmh faster than everyone else..until they crash
In the past 5 years, 11% of drivers killed, ...had ecstasy, speed, or crystal methamphetamine (‘ice’) in their system: ADF 2017.
There are times when I, somewhat cynically I admit, tend to agree with a view held by a former Mayor of Port Lincoln South Australia who many times stated that all those illegal drugs should be made freely available to those who wish to consume them......
'at ten times the lethal dose!'
Problem would be rapidly 'solvered!'
Only problem with that 'solution' is just how many innocent lives would be lost along with the Darwin candidates.