How to make an operator unable to use creative in minecraft?

I have a minecraft server running an there's this issue where me and my ops have an urge to just cheat items in. Is there a way to disabe creative or something of the sort.

Guest

If you allow cheats… And you being a part of it… Pppfttt… Well-l-l-l-l

but if you kick out those who cheat… That's a different story…

Aerialnine