I don't understand the 'firmly' bit. The state's case was flimsy and the state's timeline was a total mess. The cell tower evidence was flaky and one of the state's expert witnesses rescinded his testimony. Jay is a terrible witness who changed his story multiple times. The state needs Jay AND the cell tower evidence to stick and I don't think it does.
That said, as other sibling comments are saying, one's memory is surprisingly poor. This is sort of tangential, but for example, I've sat in a classroom, where as an experiment on eyewitness testimony, someone comes in (without the class knowing what's happening) and in a very exaggerated manner steals something from the professor and then leaves. Literally a minute later, when asked, much of the class misidentifies major physical attributed of the 'perpetrator' (height, hair color, etc.), even when they are confident they are correct.
He was high. I think that part was corroborated by multiple people. Everybody reacts differently. How Adnan reacted when he heard she disappeared shouldn't be the backbone of deciding whether or not he is innocent or guilty.
All the other kids didn't think murder when she disappeared either. There was a rumour going around that she ran away to Cali to see her father. It took a few days before the realization sunk in.
Not to get in to the details, but her family called him looking for her that night. And like I said, if I get a weird phone call from a friends family looking for them and the next day they don't show up to school, you better believe it is ALL me and my friends are going to be talking about. It's just not something people, let alone high school kids, ignore.