I have been reading about cadaver dogs on the Madeleine McCann CB thread.
In studies, dogs have alerted to scent from 30+ years ago. It would be interesting scientifically to see if they alerted to the site where Shelley was found. Presumably, aside from when she was found and the weeks after, it hasn’t been too disturbed in the interim.
If an alert was indicated here, then I am wondering if by any minuscule chance the dogs would be able to find the knife or any of her possession in the vicinity.
I imagine anyway a thorough search was done at the time, so it may not be something that LE would want to do if resources were an issue. I guess there is not a lot of use in potentially finding something that you then can’t use if legal procedures were not followed.