Numb3rs Episode 3.09 Waste Not

A sink hole collapses under a school playground, killing an elder lady and injuring children at play. Don and his team down a dirty trail of illegal toxic waste disposal. As the FBI try to prove a corrupt construction company, suspected of burying containers of toxic waste under school playgrounds their company paved, is responsible for the sink hole, Charlie mathematically uncovers a bigger problem: the schools with playgrounds paved by the construction company have higher rates of cancer and neurological deficits and anyone who has been exposed to the toxic fumes through the years could be in danger.