Final answer:
In forensic psychology, according to APA guidelines, a psychologist's roles include conducting psychological evaluations and providing expert testimony, while adhering strictly to ethical and legal standards.
Step-by-step explanation:
In a forensic context according to the American Psychological Association (APA) guidelines, a psychologist might assume roles such as conducting evaluations and providing expert testimony in legal proceedings. Psychologists are called upon to act as expert witnesses and are expected to have a thorough understanding of both psychological principles and legal standards. They play crucial roles in competency evaluations, assessments of the mental state of defendants, and providing insights on matters like child custody and eyewitness testimony. Additionally, their expertize can be utilized in jury selection and witness preparation, as well as offering psychological treatment within the criminal justice system. However, options such as providing services without legal authorization, acting as a sole expert witness without collaboration, and excluding ethical considerations in legal settings are not according to the APA guidelines, as they are expected to maintain a high standard of ethical practice.