Django Auth with LDAP and Local Accounts

I currently have Django and LDAP working. However, I want to limit LDAP authentication to only the accounts within the local account DB. i.e if no local account is present deny access/ldap auth occurring.

From looking at the options from LDAPSearch I'm unable to find a direct option to provide this. Any ideas on how to achieve this?

Limiting based on LDAP OU is not an option based on the LDAP address structure in place.

Thanks,

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