 NTSIP also has Assessment of Chemical Exposure teams to assist state and local health departments in the aftermath of toxic spills.These teams interview people who were exposed to the hazardous substances and collect samples to test the level of contamination in the environment and in people.ATSDR represents the Department of Health and Human Services on the National Response Team and works with other agencies to provide technical assistance during emergencies involving hazardous substances, such as chemical spills.