XF 2.1 Set a users post to approve

Hi, we have a liked forum member but he's drinking and his posts are becoming offensive. Rather than ban him, we want to set it so every time he posts, in any forum, his post have to be approved (or rejected/deleted).

This would also apply to new threads started by him

Can anyone tell me how I go about this?
Thanks for the reply. My user details does not have a PERMISSIONS tab, can I turn this on somewhere or if not I assume I create a new user group with this approval enabled and stick him in it?