If you read really carefully, they mention a gun found in the suspect's home. The article does not provide other evidence that would link the gun or the suspect with the victim. There might be such evidence, but it's not mentioned.
Even when it is run some of these things like ballistics are a lot fuzzier science than they would have you believe and the "experts" can make a report say whatever they (or the police) want
Oh absolutely. It's all borderline pseudo science depending on who you ask. But the fact that you're not even hearing about it speaks volumes.
Evidince is just like charges. They throw everything, even the most flimsy and dishonest garbage, at the wall if there's even the slightest chance of it sticking because every bit of it that the defense has to get removed costs them resources. If they're not throwing it (like when they announce manslaughter charges for something the news portrayed as murder) it's because that particular piece has less than zero chance of sticking.
