to the Animal Models Volumes This volume describes animal models of drug addiction. Because of increasing public concern over the ethical treatment of animals in research, we felt it incumbent upon us to include this general preface in order to indicate why we think further research using animals is necessary. Animals should only be used when suitable alternatives are not available, and humans can only be experimented upon in severely proscribed circumstances. Alternative procedures using cell or tissue culture are inadequate in any models requiring assessments of behavioral change or of...