I mean taking drugs at work is pretty bad, he could have called the police but doesn’t sound like he did so really that could mean he gave you the benefit of the doubt and gave you the chance to make it better on your own. I was fired from my job 3 years ago because a resident in the care home i worked in accused me of pushing her. I didn’t but the police were involved and although It could have ruined my life, I later after a week spoke to my manager on the phone and she told me to take care and to look after myself on my next life plan.