Dr. Blake's first love is the mother of the kid who got killed. So Blake spends 50 minutes trying to take every positive illusion that she had of her son away from her. He talks to her as her old boyfriend, but on several occasions confronts her with the fact that nobody liked her son, he was thought of as a cheater, and he died due to anabolic steroids that were probably administered by the father (her husband).
He could have put his findings into the ME report, and did not have to degrade, humiliate, and destroy the mother of the deceased. The only consideration seemed to be that Blake wanted to show he was right, and he needs to be that guy who is always right. Very sad, shallow, and arrogant character.
The new Superintendent is constantly telling Blake to follow the rules, and yet Blake goes out of his way to challenge every rule. I like the show, but Blake is often irresponsible in the way he investigates situations. Additionally, as the Superintendent points out, Blake should be working for the Police, and they are the ones that should be investigating.
Blake seems to be based on the 1970s TV series Quincy, about the rogue coroner who was always investigating murders and turning in his reports late, and antagonizing everyone. I enjoy the show, but I wish Blake did not try so hard to offend everyone, especially the families and loved ones of the deceased.