One guy I employed, here in Thailand was teaching math at an International school. I took him on as a developer - again - working from home mostly. Pay was better.
Being a teacher, he had to control his drinking but when he worked from home, he ended up having Heineken for breakfast and slow burning the booze all day.
He was a functional alcoholic but if he didn't keep it at the right pace in the day, he'd end up drunk and would drop off the grid.
We had many heated discussions about it - at one point I thought he was clean, he'd gone into rehab - or so I thought. He'd actually fucked off to Chiang Mai for a month to get shitfaced.
This ended abruptly November last year. One day he fell over drunk and hit his head. He ended up in brain surgery. The docs took about a microsecond looking at him to come to the conclusion he was an alcoholic and they had to give him anti-seizure drugs for alcohol withdrawal. I hadn't seen him for a month (we just chatted on skype most of the time) but I've never seen his skin in such poor condition and so blotchy. He'd obviously worked his way up to a terrific amount of consumption in the prior weeks.
Despite good care in hospital, he wasn't improving. The doctors said this was partly because he was so deficient in Thiamine but basically, he was a shell of a man and what would have been a minor injury for most caused him serious damage. We ended up having the air ambulance service ship him back to the UK. At 4 Months he was nowhere near the state he could work and at that point, I couldn't hold on any longer and I replaced him.
He ended up back with his parents - who are in their 80's. This guy is 51, penniless and unable to work. I remember a month after the accident showing him a picture of his 2 daughters from his wallet and asking who they were - he had no idea.
Anyway - I've been here before. Hence considering cutting my losses.