find with unrelated model

I am trying to create a validation function where I check the
User.slug field against a tables of banned words

So if a user tries to use a slug "profile" it will come back invalid

I have Restrictions table with all banned words which is not related
to any model on the site.

How do I do a query from the users model to check restrictions table?

Tried App::Import('Model', 'Restriction'); method but all i get is
error -> Trying to get property of non-object
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