About DNA. First, to my surprise, I found that a science teacher taught criminology classes at Delphi High. So I would say, all students at school who were interested could have had that knowledge. Second, there are tons of online Q/A about getting rid of the DNA. The LE knows what the perp did. I don’t. But it is not difficult to find the answer he followed and find out who visited that site. I think. I assume nothing is secret online.