Final answer:
Counselors must refuse to perform forensic evaluations on current or former clients and refuse to accept clients who have been previously evaluated for forensic purposes.
Step-by-step explanation:
The statement in the question is true. According to the American Psychological Association's Ethical Principles & Code of Conduct, counselors are generally advised to refrain from performing forensic evaluations on current or former clients, as well as accepting clients who have been previously evaluated for forensic purposes.