Civil laws regarding kashrut (Jewish religious standards, mainly concerning food) are found in several countries. Advertising standards laws in many jurisdictions prohibit the use of the phrase kosher in a product's labelling, unless it can be shown that the product conforms to Jewish dietary laws; however, the legal qualifications for conforming to Jewish dietary laws are often defined differently in different jurisdictions. For example, in some places the law may require that a rabbi certify the kashrut nature, in others the rules of kosher are fully defined in law, and in others still it is sufficient that the manufacturer only believes that the product complies with Jewish dietary regulations. In several cases, laws restricting the use of the term kosher have later been determined to be illegal religious interference.
United States of America
Historically, the statutes of some states in the United States attempted to define kosher, and make it a felony to sell a product which was called kosher if, in general, it was not processed in accordance with the Jewish religion. However, challenges were made to such laws on the basis that they appear to be establishment of a religious practice by the states in question, which would constitute a violation of the constitutional rule that there should be no law respecting an establishment of religion. Although earlier courts upheld some of these laws, courts have since determined that the laws would establish religious practice, and therefore struck the laws down; opponents of this decision had attempted to argue that kashrut was simply a set of standards for food preparation, and therefore there would be no difference between labelling something as kashrut and labelling it as low sodium, high-fiber, pasteurised, calcium-enriched, or contains no cholesterol. The legal rulings include: