Anything can be reasonable doubt. but the job of the jury is to connect the dots, to make senses of the evidence, the behavior, the testimony of the witnesses, everything, but this jury were looking for the perfect evidence, they didn't wanted to do their job, they wanted the state to show them and they would had to say ohh yes, its here. I've seen so many cases where the evidence is even less than in this case, but the jury does their job and they ask questions if they need to, this jury didn't, juror 3 said that they had questions but didn't bother to ask. It seems that they wanted to solve it like if it was en episode of CSI, where they always find the smoking gun and all takes place in minutes or hours. The more they talk, the more stupid they look. Specially juror 3, anyway, they blew it.