elizabeth bartholet is a child welfare expert and law professor at harvard university.s the laws governing homeschools vary from state to state, but rarely do they provide meaningful oversight. >> in the united states, there's essentially no effective regulation. and i think that's true in all 50 states. william: in loosely regulated states, like texas, michigan and illinois, parents are not even legally required to notify their school district before homeschooling. more strictly regulated states, like pennsylvania, new york and massachusetts, require parents to turn in curriculums and assessments. but, says bartholet, enforcement is lacking. >> there are some states that, on paper, look better than others. but even the ones that look on paper as if they have some requirements of what regulation there is isn't enforced. william: she says this means authorities aren't able to really see what the lives of homeschooled children look like, from the quality of education they receive to their mental or physical health. dr. elizabeth bartholet: the requirement that all kids go