Nothing in this Part shall be construed to prohibit: any activity not specifically described in this Part; basic research and/or any writing or speech devoted to public commentary or debate or other speech protected by the First Amendment of the United States Constitution; the use, storage, or treatment and disposal of radioactive materials used in basic academic research, medical research, or the diagnosis and treatment of patients; consumer uses of radioactive material for smoke detectors, light emitting watches or clocks, industrial radiography and tracer processes, and other similar incidental applications; direct activities of the federal government or its employees; the transportation of radioactive materials to and through the Port of Baltimore; and research, development, and manufacturing associated with biotechnology. City Code, 1976/83, art. 3, §2 Ord. 92-012