This article provides an overview of the use of genetic science and technologies for criminal investigation and forensics. After discussing the history of the use of biological markers for criminal identification and forensics, we outline the emergence of DNA analysis as the 'gold standard' in forensic identification. We then discuss a range of more recent practices and issues in the field of forensic genetics. We conclude with a brief discussion of novel technologies that have not yet found entrance into most courtrooms and routine crime scene work.