OK, back to the lab. Test the thread - the fiber matches, not the color. The First was older. OK, so it was an older school sweater ...

You hear of the guy on the chat. You run to UNV but you miss him.

There's a sweater on the chair - use magnify on the flakes. Now use lifting tape to grab a flake. Then take the sweater with your gloves.

Back to the lab. The sweater fiber matches the tire iron. On the dandruff flakes, you need a comparison.

Head to the cops. Ask for Jack Riley's DNA. Go to his house and swab him. Unfortunately, the lab says it's not a match.

Back to the cops again. How about John? He was indeed supervising the exam and has an alibi.

OK, how about Franklin? Yes, that's a go.

CSI Crime scene Investigation Walkthrough