My sympathies to the Go Captain.
Here is a situation I had once.
The CSD reported to me, at a late stage in the descent, that he was reasonably certain that two passengers were using a Class A drug in the lavatory.
What would you do in this situation?
Fortunately my airline has an experienced operations department who had the solution. Customs were alerted with a description of the passengers and tried to locate them on exit. Unfortunately they were too late on the scene and the men got away. The airport police declined to get involved.
I could have done nothing I suppose BUT . . . you can't have people taking cocaine and then disposing the last of the stash in the aircraft can you?
If the Go Captain had enjoyed really good support from his operations department the outcome might have been different.
This is one of the disadvantages of working for a small airline - there is less back up and corporate experience to draw on.