Although I did not watch the episode, I am from Iowa, and there were many articles in the local newspapers yesterday about the episode. Apparently child services was inundated with phone calls and emails after the episode aired, but they are not going to do anything because "it is not against the law for peoples houses to be dirty or for them to have certain food beliefs." Also, they were able to prove that they have paperwork registering the children to be homeschooled and a certified teacher from the West Des Moines school district monitors the childrens progress and according to her, they are learning what they need.
I wish I would have seen the episode though...