Allowing specific users to only add posts using certain custom taxomy terms

First hook the save_post action: http://codex.wordpress.org/Plugin_API/Action_Reference/save_post

Then check capabilities: You have docs on that right?

Then get_the_terms for the $post_id provided by save_post and the taxonomy you want to check. http://codex.wordpress.org/Function_Reference/get_the_terms

Then if they are using a term (see note below) they are not allowed to use either stop/delete the post, set a warning, or remove the term.

Note: a taxonomy is a list of terms that can be applied to a post. Example: the taxonomy “Nation” would contain terms like “Mexico”, “France”, and “India”

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