Just started playing the game, and I have to say... even from the very first scene it's already hard to take it seriously. I mean, may I suggest the dev maybe do some basic superficial research like... I don't know, watching a few episodes of CSI, Law & Order, hell even Brooklyn Nine-Nine before writing and rendering a crime scene? It doesn't have to perfectly correct, but at least make a minimum effort to make it believable, you know?
First, why is the "prosecutor" at the crime scene? Prosecutors don't visit crime scenes, they are just lawyers for the State, they don't participate in investigations, they especially are not the first law enforcement officer on the scene that would be telling an officer from the Sheriff's office what happened. None of that makes the slightest sense. On that scene, the cop in uniform should be the first one on the scene, and they would be telling a detective what they found.
Second, none of the details of the murder discussed would be known at that point. The victims are shown as still inside the car, at this point no one would know time of death, no one would discuss cause of death, and no one would know that "they have no blood left in their bodies", all of that would only be found out AFTER autopsies.
And third, uniform officers don't declare cause of death, so there is no reason the Sheriff would give orders to the cop to bury the case by declaring a false cause of death. If this type of corruption would happen, it would also have to be done by the investigator/detective responsible for the case (you know, the guy in the suit, not the guy in the uniform), not because they figure out the cause of death, but because they are the ones writing the reports with the details of the case, which could be sent to the prosecutors if they needed to charge someone with a crime.
Basic things, you know?