Before there was DAMP
In the old days there was common sense. Don't drink and fly. Don't get high and fly!
All of a sudden some would argue that DAMP is the cause of the problem - not
A clear demand of all employers is that we pilots to remain sober and free of all intoxicating substances for at least 8 hours before flying. Most of us obey the expectation, but some don't.
CASA introduced "Drug Alcohol Monitoring Procedures" to monitor those of unknown addictions (initial test); to enable counselling of those with problems (ongoing) and to catch the dishonest (random) who think they can continue to pull the wool over the eyes of those in Authority.
If you were able to look into the etiology of this incident, I am sure you would find that this pilot has been more than fairly treated prior to and during this "incident" but at the end of the day he brought this problem down on his own head and has received his just deserts.
I have worked for the service for many years and have found them, if anything, very long suffering of employee quirks