Hi,
I've installed and enabled thinkfinger on my Thinkpad X61 tablet, as described on thinkwiki. Worked perfectly fine, but:
For some reason as long as I provide a password all sudo commands work as intended (you have to supply the password whenever you use sudo in a new shell); but as soon as I provide my fingerprint the whole system is unlocked, meaning, in a new shell, as well as using e. g. synaptic I do no longer need a password/fingerprint.

Some might see this as a comfort, but I rather consider it dangerous. Does anyone know why this is? Is this really intended?
Thanks.