Not hard to believe.
Many people don't realize that many weed and feed products contain a toxic pesticide. People also don't realize that after they apply the product to their lawn, the chemical residues are tracked indoors on shoes or pet paws, and contaminate the carpets. Because 2,4-D is broken down by direct sunlight, once the residues get into the house the pesticide lingers for months or even years. Kids who play on the floor are at particular risk, since they accidentally ingest the chemical when they put their hands in their mouths.
2,4-D is used on athletic fields, golf courses, landscaping, timber land, rights-of-way, and various crops. The airborne chemical can even travel significant distances, damaging plants downwind, and contaminating homes. This problem is poised to get worse -- Dow Agrosciences has asked the U.S. Department of Agriculture to approve genetically modified corn that would allow farmers to spray the entire crop with large amounts of 2,4-D (without harming the corn); some experts estimate that this will increase 2,4-D use by 50 fold, and farmers of other crops are very worried that this overuse will harm their crops and their families.