Poison Center Signal Detection System   Collects data on acute and chronic exposures for all ages from 43 of 60 poison centers, accounting for a population of more than 200 million people in rural, urban, and suburban areas of the United States. Provides prescription drug abuse and misuse data on acute incidence where the caller is requesting advice on how to treat an exposure to the medication.   Richard C. Dart, M.D., Ph.D., Rocky Mountain Poison & Drug Center, is the principal investigator of this system.   For more information about participating in the Poison Center Signal Detection System, please contact Elise Bailey.