dr. tang: once the sample comes into our laboratory, we will separate them into different components and put them in different storage condition to better preserve for current studies and for future studies. narrator: results from these samples combined with neurological testing and air monitoring have revealed a clear connection between exposure and development. dr. whyatt: this one insecticide in particular, which was the one we knew was being used the most, we were detecting it in about 70% of the mothers' blood and 70% of the babies' blood. the level in the mothers' blood and the babies' blood was basically identical. and then what we found was that the babies that had the highest level of this insecticide had significantly lower weight and length at birth anand significantly poorer mental and motor development at age 3 and significantly greater behavioral problems at age 3 things like adhd. and one thing that we're committed to is as we find evidence of harm, we immediately let the women