Disable ability to create new user accounts?

Community Champion

We've been having a rash of faculty adding in students using incorrect email addresses, which then causes the students to have multiple accounts.  Is there any way to disable the ability for non-admins to create new user accounts?  We've tried education and adding warning messages to the "add people" page about the issue, but neither seems to have slowed this down, and now we have several hundred extra accounts in the system.  I really would like to avoid having to merge all of them with their "real" account.

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