 Two more issues are addressed in the Sunday Herald article , but not in the Daily Mail article . The first is of the knots used to tie up Carol 's body – the knots on Carol 's body were mostly granny knots , of which there was no evidence that Gordon ever used – indeed during the trial he was specifically asked this , and he responded , " I do not use granny knots " . The granny knot is always a mistake , used by someone who should have used a reef knot ; those learning knot @-@ tying frequently make this mistake . Gordon Park , an experienced knot @-@ <unk> , would likely never use a granny knot , and their frequent appearance on the body of Carol is strong evidence that it was not Gordon who tied them . The article also claims that the evidence of knots was irrelevant anyway , as <unk> and <unk> were so common in the area . The other piece of evidence related to another rock taken from the <unk> , which had supposedly come from the Parks ' roof . However , the prosecution eventually admitted that Westmoreland green slate had been worked in the area for hundreds of years , and could have come from anywhere . The Herald also mentions the fact that the police files from the original missing persons inquiry into Carol Park had gone missing themselves , but does not draw any conclusions from this . 
