"Unwanted residues in our food"

Whole rat found inside tin of baked beans (the picture accompanying the story is wonderfully gruesome):

“The rat had come to an untimely end, but was not possible to say if it had died before or after it got into the beans. But enzymatic tests established that it had been through the canning process. A post mortem examination showed that it hadn't eaten recently - it had not enjoyed a last meal of baked beans"