Called once a client is authorized and fully in-game, but before admin checks are done. This can be used to override the default admin checks for a client. You should only use this for overriding; use OnClientPostAdminCheck() instead if you want notification.
Note: If handled/blocked, PostAdminCheck must be signalled manually via NotifyPostAdminCheck().
This callback is guaranteed to occur on all clients, and always after each OnClientPutInServer() call.
Action OnClientPreAdminCheck(int client)
Plugin_Handled to block admin checks.