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[eluser]xwero[/eluser]

Code:

function access_allowed()
{
    $controllers = array('crtl1','ctrl2'); // you can move this to the hooks.php params key for more flexibility
    $CI =& get_instance();
    $CI->load->helper('url'); // to be on the safe side
    // check if the controller is protected
    if(in_array($CI->uri->rsegment(1),$controllers))
    {
        // do some more checking
        if ($something == FALSE)
        {
             redirect('some/error/page');
        }
    }
}

Call this function in a post_controller_hook