You are to take the case as presented by the prosecution, the case as presented by the defense, and rule one way or the other.

You are not, as someone with no legal training, no background in law or litigation, and no experience in the courtroom outside of being on a jury, supposed to start reading decades old case law and attempting to interpret it.

Lawyers are not paid $300 an hour because they've come up with a sweet gig, it's because the average person (yes, even the average software developer) does not have the context or experience to understand the finer points of the laws in question.