Zend certified PHP/Magento developer

a change with visudo doesn’t work

I issue visudo command, add this rule to the very end of the file, save the file and quit.

newuser    ALL=/usr/sbin/useradd

However newuser is still able to run such commands as

sudo touch file1

And the added rule to sudoers file seems not to work. Why ?

I have logged out/in after modifying the file.