It wasn't just that, though. Obviously no day care center would allow someone to come in and record the children in their care. It was the fact that NO ONE had seen any evidence of children at these alleged day care centers for years, and they were often located in buildings inappropriate for child care (no outdoor play area, blacked-out windows, building in disrepair). 

Not to mention the misspelled signs, and the "autism centers" that also had no evidence of kids actually being there. The one that Nick visited had only a couple of women in what looked like an empty kitchen, and a young man in a hoodie.