You may find what you are looking for in these couple of posts on my blog

Therapy Consumer Guide | Does Everything I Share With My Therapist Stay Confidential?

Therapy Consumer Guide | When Is A Therapist Allowed to Break Confidentiality?

What's described there pertains to CA but, I believe, in other states, the laws are similar. If you want to know about confidentiality laws in your state specifically you need to contact your state licensing board your therapist is registered with.