The output forms either an open circuit or a connection to ground. The output usually consists of an external pull-up resistor, which raises the output voltage when the transistor is turned off. When the transistor connected to this resistor is turned on, the output is forced to nearly 0 volts.
The Gun Control Act of 1968 (GCA or GCA68) is a U.S. federal law that regulates the firearms industry and firearms owners. It primarily focuses on regulating interstate commerce in firearms by generally prohibiting interstate firearms transfers except among licensed manufacturers, dealers and importers.
The legislation in question is known as an amendment to the Arms Export Control Act passed in 1977, generally known as the Symington amendment. As described by Sy Hersh in The Samson Option, the act makes it illegal to provide U.S. foreign aid funds to those nations that sold or received nuclear reprocessing or enrichment materials, equipment, or technology.