The stupid bellybutton Sheriff(A lawyer by the name of Margo Fraiser), had the nerve to say that they were able to escape because:
1. Toilets are required in the rec yard.
2. ADA caused them to make the toilets, well, ADA-able.
And that is how the prisoners were able to escape. What a moronic woman she is.
Oh, but, just to make you feel better, she also said that "the required number of guards were watching them". Don't know about you, but if they escaped, I feel the required number wasn't watching them.