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Regulations of the FDA.
The FDA regulates everything that the USDA does not. The USDA regulates meat, poultry, and egg products. (defendingfoodsafety.com)
The common sources of contamination
The common contaminants are Salmonella, E-coli, Calicivirius, Staph, Botulism, and Listeria.
 These are ways food can get contaminated:
1. Exposure to feces, bacterial infection, and contaminated ground water. (These happen at the farm.)
2. If food is improperly heated or cooled it becomes a bacterial paradise. (This happens in transportation when in the back of a hot truck.)
3. When pieces of metal shavings, pesticides, and chemicals get in the food it contaminates the food. (This happens in the factory.)
(eagletechnology.com)
Technology
The researchers at Purdue University have made a machine that electrifies the food to get rid of any salmonella or E-coli in prepackaged food. It uses 30-40 watts of electricity and it only takes 30 seconds to 5 minutes. (defendingfoodsafety.com)
Space researches found out that salmonella is more damaging in space by doing tests on the space station.