Where will the incident with the sudo command be reported to? If a non-admin types a sudo command in Terminal, this will appear after they enter their password:

User is not in the sudoers file. This incident will be reported.

Where is this reported to?
The event will be logged in /var/log/secure.log and a mail will be sent to root (which by default goes to /dev/null which is Unix speak for it is discarded).