"Be cautious about "informal" requests from attorneys, particularly if they involve your own patients."

http://www.ncbi.nlm.nih.gov/pubmed/23507816

J Psychiatr Pract. 2013 Mar;19(2):152-6. doi: 10.1097/01.pra.0000428561.79082.53.

Avoiding (or Fixing) Problems with Lawyers and Courts.

Reid WH.

Abstract

Clinicians who do work for attorneys and courts sometimes encounter problems in defining their roles, with access to records or litigants, with unexpected changes or additions to their tasks, or with being compensated for their work. Understanding the context of the forensic consultation and the processes commonly employed by lawyers and the judiciary can prevent many problems. Be cautious about "informal" requests from attorneys, particularly if they involve your own patients. Maintain solid business practices and make sure your role, relationship, and financial agreement with the person or entity retaining you are clear, ethical, and well documented before you begin work on a case.