Are Subpoenas on Exxon Mobil Inquiries Valid? Experts Say Yes, and No. Attorneys General, First Amendment (US Constitution), Subpoenas, Exxon Mobil Corp, Smith, Lamar S, 350.org, Johnson, Eddie Bernice, Rotunda, Ronald D, Schneiderman, Eric T, Healey, Maura (1971- ), Global Warming