Hamilton Nolan's "Press subpoenas are a wake-up call for PR," (PRWeek, May 11) addresses certain First Amendment issues of speaking to the media and raises the challenges of protecting sources.

The practical answer for anyone conducting media relations who is concerned about a subpoena is to know when and how to go off the record strategically and to understand a 1991 US Supreme Court ruling, Cohen v. Cowles Media Co., publisher of the Minnesota newspapers the St. Paul Pioneer Press ...