Frequent headline
It's amazing how often a report like this pops up.
In the past three years I've seen both captains and first officers with drinking problems, drug problems and full blown addictions. The majority going undetected or unreported.
While those with the addiction think people don't know about it, many do but choose not to officially report it, instead speaking to the colleague in private and attempting to help them. It will always be a problem with the job.