When you say verified, I'm assuming you mean verified to ensure the person is a member of the forum?
If that is the case, then just make sure whatever PHP file the member is accessing has
require("global.php"); located in it near the top of the file, and shortly below this line of code add:
PHP Code:
if($bbuserinfo[userid] == 0){
eval('standarderror("'.gettemplate('error_noregister').'");');
exit;
}