If Luke was responsible, I would have thought it inconceivable that he wouldn't leave some trace of his DNA.
Therefore, if the tests show no DNA belonging to Luke, does that strongly suggest that he was not responsible?
Eye witness evidence is notoriously unreliable, as I'm sure we all agree.
How rigorously were other suspects investigated?
The forensics failed to find any forensic link between Luke and Jodi yet they were together earlier. At the very least there should have been hair from Luke on Jodi and vice versa.
That said however the crime scene was not protected overnight and Jodi's body lay out in the rain. Little wonder incriminating evidence was lost.
Jodi was attacked from behind, hit with a stick and then her throat was slit, she would have bled out towards the front while her attacker stood back until she was unconscious. Some blood was found on the nearby wall where she stumbled after the initial assault. Something which is not widely known but such was the viciousness of the assault that her throat was almost severed. Her attacker also took sadistic pleasure in cutting her eyelids.
To answer your question therefore, no, it doesn't suggest that he was responsible. A common myth which has been promoted is that Jodis attacked would have been covered in blood, there is no evidence to suggest this.
A little memento which Mitchell carved after Jodi's murder.
The Finest Day I Ever Had Was When tomorrow Never Came
JJ 1989 - 2003