Final answer:
A mental health directive is a legal document that outlines a person's preferences for mental health treatment. Witnesses of the directive must be adults who are not beneficiaries or heirs.
Step-by-step explanation:
The requirements for a mental health directive vary depending on the jurisdiction, but generally, it is a legal document that allows a person to outline their preferences for their mental health treatment in the event they become incapable of making decisions.
The requirements for witnesses also vary, but typically, witnesses must be adults who are not listed as beneficiaries or heirs in the directive. They should have the mental capacity to understand the nature and effect of the document they are witnessing.
Overall, it is important to consult with an attorney or legal professional in your jurisdiction for specific requirements regarding mental health directives and witnesses.