Erin McCanlies was listening to the radio one morning in April when she heard Robert F. Kennedy Jr. promising to find the cause of autism by September. The secretary of Health and Human Services said he believed an environmental toxin was responsible for the dramatic increase in the condition and vowed to gather “the most credible scientists from all over the world” to solve the mystery.

Nothing like that has ever been done before, he told an interviewer.

McCanlies was stunned. The work had been done.

“That’s exactly what I’ve been doing!” she said to her husband, Fred.