411 U.S. 655 93 S.Ct. 1804 36 L.Ed.2d 567 UNITED STATES, Petitioner,v.PENNSYLVANIA INDUSTRIAL CHEMICAL CORPORATION. No. 72?624. Argued March 27, 1973. Decided May 14, 1973. Syllabus After the District Court refused respondent’s offers of proof of reliance on Army Corps of Engineers regulations limiting violations to those impeding navigation, respondent was convicted of violating ? […]
