It's nearly a job for life if you don't literally fu.. up.
I never did, but not because I couldn't. I never told anything about anyone to the elders. I had quite some dirt in quite a few elders. I saw one drinking at a hotel bar with some woman that looked like a "working woman", another carrying a birthday cake for one of his students (he was a teacher), one that dressed like Santa at a corner downtown my town. I saw a couple of them at the porn theater, and I had sex with one when he was an elder. Had sex with another who later became an elder.
I never bothered saying anything to anyone. The reason was more along the lines that I can't really care less about the JW structure and how they do things. Plus to be honest, I think that there's some humanity in me. My encounter with the elders, as much as I was able to handle them, were not pleasant.
I guess I was just happy of reaffirming my point that they are all full of --it, and that elders are not to be trusted.