DNA can't prove intent. You have cases where you already know who did it. The question is, when you take all the facts, what crime is that? First-degree murder? Second-degree? Manslaughter? |
I've had cases where the lab simply cannot make a conclusion. The blood can get mixed with other things and deteriorate over time. On TV, the DNA evidence always comes back. |
Most cases don't turn on DNA evidence. Most turn on eyewitness testimony and admissions by defendants. |