the forensisc said the killer would be cobered in blood i belive.
this was incredible bloody murder id say it would be nigh on imposable for the killer not at least some blood on them.
Here are the facts..
You haven't seen the crime scene photos.
Forensics sometimes get things wrong. It happens.
Luke had time to change/clean himself up.
The prosecutions theory was that his clothes were burnt in the log burner. Jury members did not have to believe the prosecutions theories or agree with them.
As I've said before, if Luke didn't do it, who did?