Kashrut
Among the numerous laws that form "kashrut" are prohibitions on the consumption of certain animals (such as pork and shellfish), mixtures of meat and milk, and the commandment to slaughter mammals and birds according to a process known as "shechita". There are also laws regarding agricultural produce that might impact the suitability of food for consumption.
2013 horse meat scandal
Observant Muslims and Jews consider it sinful to eat certain types of meat, pork for both groups and also horse and many other animals for Jews, due to religious prohibitions. Professor Reilly stated "for some religious groups or people who abstain from eating pig meat, the presence of traces of pig DNA is unacceptable".
On 15 March 2013 it was confirmed by a Westminister wing on Health and Safety that pig DNA had been found in halal chicken sausages produced for schools.