Alright, let me tell ya a little story. I had a couple friends, for the sake of privacy, I'll call one COOL, and call the other ASS.
COOL was selling weed, me and all my friends knew and frequently bought from him. He was doing pretty good in terms of turning a profit. Until one day, two people broke into his house, held him up at gunpoint and stole all of his money. It has now come to light that the person who did this, was our former mutual friend ASS and some other douchebag.
Even though I know who committed this crime, I still will not talk to cops about it. No good would come of it. Getting the law involved almost always makes a situation worse. I will only call the cops if absolutely necessary, luckily I've never had to call them in my life thus far. Fuck cops, and fuck ASS, who I thought was a good guy up till now.
I find solace in knowing that ASS will continue to do stupid shit his entire life, and will soon be fucked by the long dick of karma. So, moral of the story, don't fucking snitch.