engine - 4:44 pm on Jul 8, 2013 (gmt 0)
Great advice from Martinibuster.
If the terms of agreement between you and your member prohibits it, then the member should not fear being censored. Tough love!
You might also consider making that particular section pre-moderated. In other words, all posts are on hold until you, or a moderator approves it. Useful if it's a constant problem.