Sasquatch
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I sure hope you're right!
If the shoestring was on or near his remains this would be an important clue. If it had Dylan's DNA on it, even better. If it was knotted or configured in such a way to suggest it was a murder weapon (strangulation) or was used as a hauling tool, this too would point to homicide. But where I get stuck is -- even if the shoelace tells a story of murder, how can this implicate a particular perp? Additional DNA on the shoelace maybe? Anything else??
If a knotted shoestring was used as a murder weapon or a hauling tool, the type of knot can sometimes point to someone with specialized skills. For example people who work on boats, hike or mountain climb might possibly tie a knot in a manner that the average person wouldn't even think of doing. Here is a guide from the Forensics Sciences Journal on an overview of Knot Forensics:
"Most people in the general population do not tie sophisticated knots (Chisnall, 2000, 2010). Specialized knots are utilized in specific recreational and occupational activities, like sailing, climbing, macramé and vertical rescue. Simple knots are encountered most frequently in general tying practices and in case evidence (Chisnall, 2010). These are tied innately and the ability to tie simple knots is acquired when people are very young (Piaget, 1929/1951, 1948/1967)."
BASIC PRINCIPLES OF FORENSIC KNOT ANALYSIS: A QUALITATIVE STUDY OF TYING BEHAVIOUR - Robert Chisnall, B.Sc., B.Ed., M.Ed.
www.investigativesciencesjournal.org/article/download/6687/5037