RESUMO
This article describes three major developments in forensic evidence and the use of such evidence in the courts. The first development is the advent of DNA profiling, a scientific technique for identifying and distinguishing among individuals to a high degree of probability. While DNA evidence has been used to prove guilt, it has also demonstrated that many individuals have been wrongly convicted on the basis of other forensic evidence that turned out to be unreliable. The second development is the US Supreme Court precedent requiring judges to carefully scrutinize the reliability of scientific evidence in determining whether it may be admitted in a jury trial. The third development is the publication of a formidable National Academy of Sciences report questioning the scientific validity of a wide range of forensic techniques. The article explains that, although one might expect these developments to have had a major impact on the decisions of trial judges whether to admit forensic science into evidence, in fact, the response of judges has been, and continues to be, decidedly mixed.