If a Counselor Is Aware That a Client Is Engaging

If a counselor is aware that a client is engaging in using illegal drugs, is the counselor bound by law to notify the proper authorities of this activity?

A) No, the counselor should try to get in on the action.
B) No, the only way the counselor should break confidentiality is if the client's activities will likely do harm to himself or herself, another person, or property.
C) Yes, any illegal activity should be reported to the proper authorities.
D) Yes, but it should only be done anonymously so as not to lose the trust of the client.