If he converts his surfer hair to dreads, they can't fire him. He will need also need to pull/ponytail his hair back. The employers know about the dreads rule and know that they will get sued if fired for that reason.
wonder if the employer will hold on to the opening for the minimum 3-6 months it takes to establish dreads. i don't know that the protective laws apply to someone who is attempting to achieve dreadlocks but is still early in the process (and wonder if the kid is willing to put in all the time and effort developing and maintaining them entail).