USDA's Animal and Plant Health Inspection Service (APHIS) is responsible for enforcing the Animal Welfare Act (AWA; 7 U.S.C. 2131 et seq. ), which requires minimum standards of care for certain warm-blooded animals bred for commercial sale, used in research, transported commercially, or exhibited to the public. However, the act excludes farm animals raised for food and fiber from coverage. The Humane Methods of Slaughter Act (7 U.S.C. 1901 et seq. ), enforced by USDA's Food Safety and Inspection Service (FSIS), governs the slaughter and handling of livestock (but not poultry) at packing plants. Also, under the so-called Twenty-Eight Hour Law (49 U.S.C. 80502, last amended in 1994), many types of farm animal carriers "may not confine animals in a vehicle or vessel for more than 28 consecutive hours without unloading the animals for feeding, water, and rest." At the state level, laws to prevent deliberate animal cruelty sometimes apply to farm animals, but few states have prescribed on-farm treatment standards. That appears to be changing in states where animal activists have sponsored successful ballot measures to impose care standards on animal producers. In Florida, voters approved a 2002 ballot measure outlawing gestation crates for pigs; in Arizona, voters did the same, along with a veal stall ban, in 2006. In 2008, California voters approved Proposition 2, which will require that veal calves, egg-laying hens, and pregnant pigs be allowed to lie down, stand up, fully extend their limbs and turn around freely. The California law, to take effect in 2015, subjects violators to misdemeanor penalties of up to $1,000 in fines and/or 180 days in jail. Maine and Michigan have also passed laws regulating the housing of farm animals. Many animal protection groups assert that today's industrial farming systems perpetuate standard practices that in their view are harmful to animals' well-being. Examples include: rearing large numbers of livestock or poultry in close confinement with little or no room for natural movement and activity (e.g., housing sows in small gestation crates, chickens in battery cages); isolating veal calves in small crates; performing surgery such as docking hog tails, dehorning cattle, and trimming poultry beaks (so that confined animals do not hurt each other or their handlers); permitting commercial movement of nonambulatory livestock ("downers") that are disabled due to sickness or injury; and not fully stunning poultry (which are not covered by the humane slaughter act) and, sometimes, livestock (most of which are covered) before slaughter. Some of these groups point to the relation between intensive animal agriculture and soil and water pollution, food safety problems (e.g., misuse of animal drugs, and foodborne bacterial illnesses), and the decline of smaller-scale, "family" farms. They also believe that if regulators approve future applications of biotechnology—such as animal cloning, genetic alterations to improve productivity, and the use of livestock as "factories" for pharmaceuticals and human organs—animal well-being will be compromised. Some animal rights groups advance the more controversial argument that humans have no right to use animals for any purpose, including for food. Farmers and ranchers maintain that they understand their animals' welfare needs and address them adequately. They express concern that efforts by poorly informed critics could lead to costly and counterproductive regulations harmful to their industry and the animals alike. Agricultural, food processing, and a number of animal science groups have argued that support for science, education, and voluntary guidelines are more effective ways of assuring animal welfare. Recognizing that more customers are concerned about animal treatment, some major food retailers have developed humane animal care standards their suppliers must follow. Also, various industry groups have published voluntary standards for care that they encourage members to meet, including the American Meat Institute, American Sheep Industry Association, National Cattlemen's Beef Association, National Chicken Council, Pork Board, and United Egg Producers. Several of these, along with Certified Humane Raised and Handled, and Free Farmed of the American Humane Association, provide so-called third party certification programs intended to assure consumers that products were derived from producers who followed prescribed care standards. Some animal welfare groups contend that such voluntary industry standards are not strong or specific enough, are not enforceable, and/or are primarily marketing contrivances. Members of Congress have offered various proposals to require changes in the treatment of animals on the farm, during transport, or at slaughter. Members of the House and Senate Agriculture Committees, which generally have jurisdiction over such bills, have held hearings on various farm animal welfare issues, but they have generally expressed a preference for voluntary rather than regulatory approaches to improving animal care. In the 110 th Congress, a key provision in the potentially sweeping Farm Animals Anti-Cruelty Act ( H.R. 6202 ) stated, "[w]hoever, without justification, kills, mutilates, disfigures, tortures, or intentionally causes an animal held for commercial use pain or suffering, or has responsibility for an animal held for commercial use and fails to provide food, water, shelter, and health care as is necessary to assure the animal's health and well-being appropriate to the animal's age and species," is subject to penalties of up to one year in jail and/or $100,000 in fines. "Commercial use" would mean "use, or intended for use, as food or fiber or for food or fiber production." A separate bill, H.R. 1726 , would have required the federal government to purchase products derived from animals only if they were raised according to humane standards (i.e., had adequate shelter with sufficient space to walk and move around with limbs fully extended, had adequate food and water with no starvation or force-feeding, and had adequate veterinary care). A differing version of H.R. 1726 was introduced in the 111 th Congress. The Prevention of Farm Animal Cruelty Act ( H.R. 4733 ), introduced on March 2, 2010. The bill was referred to the House Agriculture Committee's Subcommittee on Livestock, Dairy, and Poultry, where no further action was taken. The bill would have prohibited a federal agency from purchasing any food product derived from a "covered animal"—a pregnant pig, a veal calf, or egg-laying hen—unless the animal was raised with adequate space to "stand up, lie down, and turn around freely" and to "fully extend all limbs." (These phrases are defined more specifically in the bill.) The measure also would have exempted covered animals from this compliance requirement during lawful transport; during slaughter, in compliance with the Humane Methods of Slaughter Act; in lawful rodeo, state or county, or other exhibitions; in lawful scientific or agricultural research; while undergoing veterinary procedures; and, in the case of a pregnant pig, during the seven-day period immediately before the expected birth date. In the 111 th Congress, companion bills ( H.R. 1549 , S. 619 , Preservation of Antibiotics for Medical Treatment Act of 2009) were introduced that would have phased out the nontherapeutic use in food animals of seven specific classes of antibiotic drugs that can also be used to treat or prevent diseases and infections in humans. The bill ( H.R. 965 ) was reintroduced in the 112 th Congress. The legislation is aimed at addressing concerns that the widespread use of these drugs in animal agriculture has contributed to an increase in antibiotic resistance among sick patients. In July 2010, the House Energy and Commerce Subcommittee on Health held hearings on antibiotic use in animals. FDA, USDA, and the Centers for Disease Control (CDC) testified about the importance of using antimicrobial drugs judiciously and detailed current efforts underway to combat antimicrobial resistance. In June 2010, FDA published its draft guidance document on antimicrobial use in food animals. In the report, FDA stated that "the overall weight of evidence available to date supports the conclusion that using medically important antimicrobial drugs for production or growth-enhancing purposes (i.e., non-therapeutic or subtherapeutic uses) in food-producing animals is not in the interest of protecting and promoting the public health." At the July 2010 hearing, one witness testified about the importance of antibiotic use in animals. He said, "The best way to manage antibiotic uses in animal agriculture is through sound, rational, science-based policy." The witness also stated that "the removal of growth-promoting antibiotics from use in food animals in Denmark resulted in an increased reliance on therapeutic doses of medically important antibiotics to treat the ill animals." Some witnesses spoke of the need to follow the Denmark example and ban the use of antibiotics. The treatment of farm animals reached center stage in February 2008, when USDA announced the largest-ever meat recall, by Hallmark/Westland Meat Packing Co. The recall came after USDA-FSIS found that the facility for at least two years did not always notify inspectors about cattle that had become nonambulatory after they had been inspected, but before they were slaughtered for food. FSIS regulations explicitly prohibit most nonambulatory ("downer") cattle in human food, because of their higher risk of bovine spongiform encephalopathy (BSE, or "mad cow disease"). Moreover, FSIS charged that the plant had violated the Humane Slaughter Act, which first came to light after animal welfare advocates secretly videotaped what they described as employees inhumanely handling downer cattle before slaughter. The act stipulates, among other things, that "[n]o method of slaughtering or handling in connection with slaughtering shall be deemed to comply with the public policy of the United States unless it is humane." In a number of subsequent 2008 hearings, FSIS came under strong criticism for failing to enforce the act.