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Just hours after 20 children and six educators were killed in December at Sandy Hook Elementary School, investigators started gathering evidence at gunman Adam Lanza's home.

Forty-seven percent said they supported stricter gun control laws. That number was 57 percent just after the shootings.

The tests are required by federal "No Child Left Behind" laws. Officials offered the unprecedented waiver to give some relief to the victims of the shooting rampage that killed 20 first-graders.

The Senate Judiciary Committee takes up four proposals. They include a new ban on assault-style weapons. While the bills are likely to get the committee's OK, they face opposition after that.

Neil Heslin, whose 6-year-old son was killed in Sandy Hook, cried while telling a Senate Committee that guns have not been adequately regulated. He said the day he lost his son was the saddest and worst day of his life.

In the weeks following the killings at Sandy Hook Elementary School, more than a quarter-million cards, letters and gifts have arrived in Newtown, Conn. The town is trying to decide what to do with a collection that quickly outgrew its storage at the municipal building and now fills a warehouse.

After Newtown, how are other communities that have grappled with gun violence, like Aurora, dealing with the gun debate?Recent tragedies have spurred…

Authorities tell CBS °µºÚ±¬ÁÏ and The Hartford Courant that they found several news clippings about Anders Behring Breivik, who killed 77 people in Norway in 2011, in Adam Lanza's belongings.

The "gave their lives to protect the precious children in their care; they gave all they had for the most innocent and helpless among us," President Obama said.

The documentary Raising Adam Lanzaseeks a more complete view of Nancy Lanza and her son, a young man who was described as smart and awkward as a teen — and who later killed 27 people in Newtown, Conn. The documentary is built on the work of PBS Frontlineand The Hartford Courant.