I know that sounds terribly prmitive, but it appears to be the truth.
As far as driver's licenses are concerned, they may be purchased. Our own DMV in Virginia found itself having issued numerous bad drivers licenses to the 9/11 hijackers.
Unless a driver's license conforms to the new federal standards it doesn't mean a thing, and probably won't even let you in the front door at the post office.
It seems to me that you are looking at this situation backwards.
It's irrelevant that some types of identification are superior to others.
What is relevant in this case is that the adult women who were unjustifiably held as minors appear to have presented to the authorities ALL THE IDENTIFICATION THAT EXISTED FOR THEM. It was the burden of CPS to recognize valid identification when it is presented.
If you propose that the identification supplied was insufficient, then what was expected from such a woman to get herself released? She is out of options. How long should CPS be permitted to hold a woman who has submitted to them all the identification information on her that exists?
If you propose that the identification supplied WAS sufficient, then how long should CPS be permitted to hold a person who has presented sufficient identification?