I don't know for sure as I have only been a mod for a short time. I guess if someone was extremely abusive in every post or was an obvious stalker or predator they would be banned. No one has been banned since I have been on here. Most of the people are friendly with the occasional disagreement but thats to be expected.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France