The Case Studies in Environmental Medicine (CSEM) are a series of self-instructional courses designed to increase the primary care provider's knowledge of hazardous substances in the environment and to aid in the evaluation of potentially exposed patients. Continuing medical education (CME) for physicians, continuing nursing education (CNE) for nurses, continuing education units (CEU) for other professionals, and continuing education contact hours (CECH) for certified health education specialists (CHES) are offered in support of this series.