Comment Re:That's not how it's supposed to work. (Score 2) 99
You know, you make good arguments, except they're irrelevant to this case.
The police used the DNA markers found from testing the blood left in knife sheath and found a strong connection to the defendant's father using those databases.
Once the connection was established, they did a cheek swab test and the DNA found on the knife sheath on the crime scene was confirmed to be his.
I'd say that was pretty good detective work, and anything but circumstantial.