Choking is the number one reason for accidents, but chemicals such as lead can also cause developmental problems like behavioral disorders and sickness. Exposure to lead can affect almost every organ and system in the human body, especially the central nervous system. Lead is especially toxic to the brains of young children. In the US, the CPSC and Customs and Border Protection are responsible for screening children's products imported into the country. Just less than 10% of products screened are stopped for violations. Nearly two thirds are stopped for lead violations and 15% are stopped for choking hazards.