The following video shows the "suspicious stains on the walkway beside the house" at 0:59~1:05. They do look like blood stains.
http://www.youtube.com/watch?v=MgXr5W3P4Qg
P.S. IF DG (or anyone with chemistry background) was involved, perhaps he could use chemicals to make the DNA from the blood not recognizable?
http://www.youtube.com/watch?v=MgXr5W3P4Qg
P.S. IF DG (or anyone with chemistry background) was involved, perhaps he could use chemicals to make the DNA from the blood not recognizable?