It depends which kind. I can show you where you can find a Ban Bypass that keeps you from getting banned for a limited but pretty long amount of time. You can download it here: http://www.se7ensins.com/forums/threads/re-release-tu18-y0da-pro-v3-8.1071140/
Note: Make sure you read the spoiler for the Bypass instructions.
The other kind is a Ban Bypass that allows you to play on a banned BO2 profile. But I have only seen private bypasses like that.