How can I disable someone's chat in-game?

Can someone give me some information on this? I want a script that will be able to disable a certain players chat bar so they cannot speak anymore, thanks.

You have to create custom chat GUI for that. Thought don't expect anyone to give you read script, this place isn't for requests.

Basically, here you can see how to make custom chat: http://wiki.roblox.com/index.php?title=How_to_Make_a_Pseudo_Chat_GUI

If you have admin in that game(like Kohl's admin or something), Just say the ingame chatting functional script command first, and then put this

Player1.SuperSafeChat = true

But change Player1 to the user's name.