Most of those sickened as a result of the adulteration were babies fed formula that contained melamine.
Tesco says tests on 149 of its products are clear, and Sainsbury's say their tests show no horse adulteration.
It said there was no suggestion there had been a problem with adulteration.
The Congress should not encourage, let alone facilitate, such efforts by holding open the Patriot Act for further revision and adulteration.
Meanwhile, new tests conducted on beef retail products revealed no new cases of horsemeat adulteration, the British Retail Consortium (BRC) has said.
The FSA has asked retailers to test beef products for the presence of more than 1% of horsemeat, with anything above that figure considered to be a sign of adulteration.
Subsequent rounds of testing revealed adulteration in some products sold by Asda, Sodexo - which supplies food to schools, care homes and the armed forces - and the Whitbread Group.
MPs rejected a motion calling for the government to ensure that the police and fraud specialists investigate criminal networks involved in horsemeat adulteration and speed up the FSA tests to restore consumer confidence.
The 1938 Food, Drug and Cosmetic Act bans the adulteration of food by any agent intended to dupe the consumer into thinking the product is superior in quality or more nutritious than it actually is.
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There is another more pressing reason to legalize and regulate marijuana, even for the sake of our children: the potential for adulteration of black-market cannabis and the substitution of even more dangerous copycat compounds.
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