chroot: login console does not ask root password

[Victor Munoz <vmunoz@macul.ciencias.uchile.cl>]

Hello. I've been playing with chroot + debootstrap to have some sid
environment in my woody machine, following the suggestions in 

http://www.debian.org/doc/manuals/reference/ch-tips.en.html

I got to the point of setting up login for chroot (Sec. 8.6.35.2). 
tty8 is available now for login, but surprinsingly, I type root, and
I am logged in without password. I have created a normal user in the sid 
environment, and when I try to login as such in tty8, I am asked for the 
password. 

To have the login console I added this to /etc/inittab (in woody system),

8:23:respawn:/usr/sbin/chroot /disco/sid /sbin/getty 38400 tty8

I haven't found a mention in my web searches of a similar problem. How can I
force the system to ask for password if root wants to login?

 Regards,
 
 	 						 Victor