Treating a sick animal with medicines may lead the animal product containing some of those medicines when the animal is slaughtered, milked, lays eggs or produces honey, unless withdrawal periods are adhered to which stipulate a period of time to ensure the medicines have left the animal's system sufficiently to avoid any risk.[94] Scientific experiments provide data for each medicine in each application, showing how long it is present in the body of an animal and what the animal's body does to metabolise the medicine.