Yes it's true that some people are chronic addicts who can easily control any volume of alcohol they consumed along the line at a time can walk and work perfectly fine without anyone noticing it. Although initially I didn't know he was only monitoring his trade with the smartphone, while I thought he was trading, I tried confirming from him the next time we met again and he said wasn't really deep into trading that very day he was monitoring rather.
There are several phases during which alcoholics are still able to control themselves and their brains, but to a certain extent they will lose their minds and will influence their decisions. Trading while drunk is ridiculous, but they can still trade while feeling sober or relaxed. Of course there are some traders who trade while drunk, but the drunk phase is not to lose their minds. I mean they can still control everything, including being able to trade.