Although I don't know how to fit this law in with the Bob from the TV series other than to say the White council seems to allow the breaking of the laws under curtain curcumstances for themselves alone.

Remember that the Laws apply on in regards to Mortals.
Bob is an Air Spirit from the NeverNever, residing in a skull. He was never Human.

Kristine was asking about Bob in the TV show who was the Spirit of a Wizard Sealed into a skull (presuably his own) only answers I have to this are.

1. TV reality is slightly diferent then Book or rpg reality.
2. This happened hundreds of years ago laws could have been diferent.
3. Could have been the Blackstaff that did it. (Every time something illegal happened it was the black staff.   Yah that's it.)