Although I grow every year, I have only planted a total of 3 seeds over the last 5 years. Because I prefer to grow from clones, which I have easy and free access to. But 2 months ago an aquaintence gave me a few plants (Trainwreck). I naturally assumed they were clones. Well if they were they were male clones. Because I was tending my garden this a.m. and I saw on one of the plants the dreaded balls--something I haven't seen on any plants I've grown since '00. I carefully check each plant every few days (not for sex but to check general health and to make sure they don't have any bugs). Good thing I do. I certainly didn't expect any males. Anyway he was immediently dispatched and will end up as happy butter. So here's a word to the wise for novice growers--check your plants often (every 4--5 days at least). If you see a plant with pollen sacs ditch it. The only 100% safe way to dispose of it is to burn or bury it.
Very good point Ranger,males can form flowers in that time and destroy a garden,sorry to here they turned male on ya.
I recently went away leaving the mother in law to water the grow. When I returned, 1 of the 10 femenized seeds turned out Male and loaded with balls. Chopped and on the compost heap within 2 minutes.