Human-Animal Chimera Prohibition Act of 2025
HB2161, the Human-Animal Chimera Prohibition Act of 2025, would amend title 18 of the U.S. Code to create a new federal criminal offense covering certain human-animal chimeras. The bill defines a broad category of “prohibited human-animal chimera” to include specified embryo combinations and engineered nonhuman life forms with human gametes, human neural tissue, or human-like facial or bodily features. It also defines “human embryo” for purposes of the chapter as an organism of the species Homo sapiens from one cell through eight weeks of development.
The bill makes it unlawful, when done knowingly and in or affecting interstate commerce, to create or attempt to create a prohibited chimera, transfer a human embryo into a nonhuman womb, transfer a nonhuman embryo into a human womb, or transport or receive a prohibited chimera for any purpose. Violations would be punishable by up to 10 years in prison, a criminal fine, or both. If the violator derived pecuniary gain, the bill would also impose a civil penalty of at least $1 million or twice the gross gain, whichever is greater.
The bill includes an express rule of construction stating that it does not prohibit research involving transgenic animal models containing human genes or transplantation of human organs, tissues, or cells into animals, so long as those activities do not fall within the prohibited conduct. It would also add a new chapter heading to the table of chapters in title 18, making the prohibition part of federal criminal law.
The available context shows the bill was introduced in the House and referred to the Judiciary Committee, with no recorded votes or committee transcript available. Based on the text alone, the bill appears to reflect concern about emerging biotechnology and ethical limits on human-animal embryo research, while preserving some existing biomedical research and transplantation activities. Because there is no recorded debate in the provided materials, there is no documented opposition or support in the committee record here, but the breadth of the definitions suggests potential contention over how far the federal ban would reach and whether it could affect legitimate research.
HB2161 would add a new federal criminal chapter to title 18, U.S. Code, creating nationwide prohibitions on specified human-animal chimera creation, transfer, transport, and receipt in interstate commerce. It would expose violators to criminal penalties and substantial civil fines, while expressly preserving certain transgenic animal research and animal transplantation activities that do not meet the bill’s prohibited definitions.
No committee transcript or vote record is provided, so there is no documented floor or committee sentiment to measure. The bill’s introduction and referral suggest it was advanced for consideration, and its text indicates a policy goal of restricting ethically controversial chimera research while carving out some biomedical exceptions.
The main likely point of contention is the scope of the definitions, especially what counts as a prohibited human-animal chimera and whether the ban could reach cutting-edge research involving human cells, neural tissue, or embryo manipulation. Supporters would likely emphasize ethical and moral concerns about human-animal mixing and embryo experimentation, while critics may argue the definitions are broad, scientifically imprecise, or could chill legitimate biomedical and regenerative research despite the stated exceptions.