It happens, not often but it does. No website can completely stop this, even PayPal and Facebook have quite a bit of trouble with this. But since we are small our forums general operate on experience and reputation, we generally catch them and ban them again, so there is no way to hide long term.
That is an odd question to ask out of the blue. If you think someone has done this, you should email me privately and let me know, this is not something that should be posted publicly.[this post was last edited: 11/7/2014-10:04]