time of the underlying conduct unless there is a clear statement that an amendment should apply retroactively to pre-enactment conduct. See, e.g., Hughes Aircraft Co. v. United States ex rel. Schumer, 520 U.S. 939, 952 (1997) ("Given the absence of a clear statutory expression of congressional intent to apply the

time of the underlying conduct unless there is a clear statement that an amendment should apply retroactively to pre-enactment conduct. See, e.g., Hughes Aircraft Co. v. United States ex rel. Schumer, 520 U.S. 939, 952 (1997) ("Given the absence of a clear statutory expression of congressional intent to apply the

time of the underlying conduct unless there is a clear statement that an amendment should apply retroactively to pre-enactment conduct. See, e.g., Hughes Aircraft Co. v. United States ex rel. Schumer, 520 U.S. 939, 952 (1997) ("Given the absence of a clear statutory expression of congressional intent to apply the

time of the underlying conduct unless there is a clear statement that an amendment should apply retroactively to pre-enactment conduct. See, e.g., Hughes Aircraft Co. v. United States ex rel. Schumer, 520 U.S. 939, 952 (1997) ("Given the absence of a clear statutory expression of congressional intent to apply the

time of the underlying conduct unless there is a clear statement that an amendment should apply retroactively to pre-enactment conduct. See, e.g., Hughes Aircraft Co. v. United States ex rel. Schumer, 520 U.S. 939, 952 (1997) ("Given the absence of a clear statutory expression of congressional intent to apply the

ct at the time of the underlying conduct unless there is a clear statement that an amendment is to apply retroactively to prior conduct. See, e.g., Hughes Aircraft Co. v. U.S. ex rel Schumer, 520 U.S. 939, 952 (1997)("Given the absence of a clear statutory expression of congressional intent to apply the 1986 amend