I configured an admin-only field (userid), however when I log on as default user and perform a serch I get access to the userid field which wasn't supposed to appear... what can I do?... thanks

I defined userid as:
usuerid => [11, 'alpha', -2, 8, 0, '', ''],
and the permissions:
$auth_no_authentication = 0;
$auth_logging = 1;
$auth_allow_default = 1;
$auth_view_own = 0;
$auth_user_field = -1;