"america tonight's" lynch ha lia tonight's" lisa fletcher has a look inside. >> mold and mildew creeping through classrooms and toys contaminated with rodent and insect droppings. these are just some of the conditions documented inside philadelphia's public schools. >> falling apart through layers of negligence. >> robin roberts is a concerned mom and member of the advocacy group, parents united for public education. growing up in philadelphia public schools. >> we don't feel safe sending our kids to an environment which we don't think is in their best health interest. there's no reason for someone to walk into a district school that is dirty that has mouse droppings that has applies on traps, that has huge mold stains on the wall. peeling plaster and paint. >> the city's top watchdog philadelphia controller allen butkovitz has been doggedly after the district for evere for years exposing a deplorable and dangerous condition for kids. >> we have highlighted the filthy conditions but there are mundane conditions we suspect are very health-damaging for kids. there's mold, there's exposed a