You would be surprised. Many clubs buy their clones from 18-25 year old kids who can't even wipe their asses properly. I have seen MANY hermis from clubs in Oakland, like Dark Heart Nursery, as well as in Berkeley. Sac is pretty good about not getting hermis. Shit dude... I have genetic hermis in seed form.. PUT YOUR MONEY WHERE YOUR MOUTH IS AND GROW THIS SHIT. har har.. The truth is that many forms of cannabis make hermi's. Mexican sativa, Thai, ect has a high chance to hermi. I have not produced any errors in about 15 years so I cannot speak for that but I can tell you, in my days of strain-shopping, some ARE genetic hermis.
and.. that is pretty funny about Hermi-Human-Halfbreeds, from Thailand!