Is it possible to prevent writers from including aditional ads?

Hello Folks!
Is it possible to prevent users from including their own ads in their posts?

For example. I want to share the ad revenue with a writer, and I place the alowed ads (adsense). But imagine the writer placing his/her own adsense ads within his/her articles. That would harm my own adsense account, (besides the unethical behaviour)

Is there a way to prevent this, or a way to spot this kind of ads?

Best regards!