She used it to get through TSA too according to NBC:
Sweeten then bought tickets for herself and her daughter, using the co-workers identification, prosecutors said. Surveillance video showed the Sweeten and her daughter boarding an airplane at Philadelphia International Airport bound for Orlando, Fla., around 4:15 p.m. Tuesday afternoon, officials said. FBI officials noted that Rakoczy did not need to provide identification to board the plane because she is a child.
http://www.nbcphiladelphia.com/news/...-in-Trunk.html
So, yeah, ID checks accomplish what exactly...? It can't even stop you from self-abducting to Disney World.