trial. police believe moody acted alone, poisoning rakes iced coffee. closing arguments in the whitey bulger trial are expected next week. ariel castro is beginning his prison sentence in isolation. ohio officials say the current quarters are for castro's safety and will stay that way until a long-term placement is agreed upon. michelle knight followed up her brave remarks directed at castro this week by returning to seymour street thanking residents for their support. knight was imprisoned for over a decade. well, edward snowden is making international headlines and getting a lot of buzz among the men and women working in the cybersecurity field. >> this is black hat. one of the biggest cybersecurity and hacker conferences in the country and it's the first major hacker conference since the edward snowden, nsa revelations.