A high-ranking Environmental Protection Agency (EPA) enforcement official in the Trump Administration recently cited a 1994 memorandum by Earl Devaney, then Director of EPA’s Office of Criminal Enforcement, as presenting guiding principles to select cases for criminal enforcement of environmental violations. The January 12, 1994, memorandum, “Exercise of Enforcement Discretion,” is often referred to as the “Devaney Memorandum,” and it is available at this link:  https://www.epa.gov/sites/production/files/documents/exercise.pdf. This may signal that criminal enforcement of environmental laws under the Trump Administration will be limited to situations in which there has been significant actual or threatened environmental harm and truly culpable conduct.