Perinatal toxicology and the law.

New perinatal toxicology research findings not only extend scientific knowledge but they also produce legal changes as they reach public domain. This article examines the interaction between perinatal drug research and the law. The reactivity of the law in assimilating research on exposure of the developing organism to a broad range of neurotoxins, including both licit and illicit drugs, is illustrated. Outcomes of some cases depend to a great extent upon legal concepts invoked rather than upon the scientific evidence involved. Proposed policy changes and their implications for scientists are discussed.