(Free 7.2) "su -l" didnt prompt password.Is it possbile?

[Robert Bonomi]

> From owner-freebsd-questions at freebsd.org  Mon Jun 18 09:25:32 2012
> Date: Mon, 18 Jun 2012 18:24:34 +0400
> From: Budnev Vladimir <vladimir.budnev at gmail.com>
> To: Mike Tancsa <mike at sentex.net>
> Cc: freebsd-questions at freebsd.org
> Subject: Re: (Free 7.2) "su -l" didnt prompt password.Is it possbile?
>
> 18.06.2012 18:02, Mike Tancsa написал:
> > On 6/18/2012 9:31 AM, Budnev Vladimir wrote:
> >> And It looked such way:
> >>
> >> %su -l
> > Before you enter this command, post the output of
> > id
> Unfortunately, we can not flashback or reproduce that step now, cause 
> we'v hurried and changed root password to avoid such strange "free 
> logins". And changing it back didnt change a thing. It was...and't went. 
> We had only buffered console output :(
> But mb you can point in what case there is possibility to make "su -l" 
> without any prompt.``o

This _will_ happen if one is root, does 'su' to another user. and then
another 'su' to root.