Environmental Protection Agency assistant administrator for air and radiation Gina McCarthy and assistant administrator for enforcement and compliance assurance Cynthia Giles sent a letter June 28 to House Energy and Commerce Chairman Fred Upton (R-MI) saying that the agency is working to give more leeway to companies that unknowingly purchase renewable fuel certificates that are later found to be fraudulent. Responding to a May 24 letter from committee Republicans, the agency announced that it has issued an Interim Enforcement Response Policy to allow those businesses to pay only modest civil fines and have their total penalties capped.