Bit of a stink

"Caley, you've rubbed n something disgusting!"

"No I haven't . In fact I have no memory of even being on a walk on that day. My advisers have told me there is no recollection of a walk then." 

"But Caley I can see the grotty stuff all around your collar, it stinks, and it is clearly visible in this photograph"

"Ah, even if this did happen, and of course I still deny it, I can assure you that all official guide lines were followed"