Permitting an unlicensed person to drive can result in:

It is illegal to permit or authorize an unlicensed person to drive a motor vehicle. Doing so can result in a 60-day jail sentence and a $500 fine. If the vehicle is involved in a crash resulting in bodily injury or the death of any person, the person who permitted the unlicensed person to drive shall have his/her license suspended for one year.
DMV Writen Test