[RMMV] IS THERE A WAY TO DISABLE ITEM USAGE FOR SOME CHARACTERS?

I was wondering if there was an easy way to prevent some characters from using items in battle. I was thinking of making a game where you are a monster trainer, and your party consists of the trainer and 3 monsters. I don't want the monsters to be able to use items because... well, they're monsters. I know you can seal skills and skill types, but there is no option to prevent item use.