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In this handout crime scene evidence photo provided by the Connecticut State Police, shows a damaged window at the Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. A second report was released December 27, 2013 by Connecticut State Attorney Stephen Sedensky III gave more details of the the Newtown school shooting that left 20 children and six women educators dead inside Sandy Hook Elementary School. (Photo by Connecticut State Police via Getty Images) ( 459541607 )

This undated photo released by the Connecticut State Police shows the scene inside Sandy Hook Elementary School, in Newtown, Conn. The photo was released as part of the evidence gathered by police during their investigation after Adam Lanza gunned down 20 first-graders and six educators with a semi-automatic rifle at Sandy Hook Elementary School on Dec. 14, 2012, in Newtown. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

Police tape lies bunched near the road to Sandy Hook Elementary School on January 14, 2013 in Newtown, Connecticut. The town marked a month anniversay since the massacre of 26 children and adults at the school, the second-worst such shooting in U.S. history. (Photo by John Moore/Getty Images) ( 159498908 )

This Dec. 14, 2012 photo released by the Connecticut State Police shows what the evidence report describes as a live 22 caliber bullet on the floor of the computer room as found in the house where Adam Lanza lived with his mother in Newtown, Conn. The photo was released as part of the evidence gathered by police during their investigation after Adam Lanza gunned down 20 first-graders and six educators with a semi-automatic rifle at Sandy Hook Elementary School on Dec. 14, 2012, in Newtown. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows an interior at the Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. A second report was released December 27, 2013 by Connecticut State Attorney Stephen Sedensky III gave more details of the the Newtown school shooting that left 20 children and six women educators dead inside Sandy Hook Elementary School. (Photo by Connecticut State Police via Getty Images) ( 459541595 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows the exterior of the Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541613 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a damaged door of the Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541597 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows firearms and ammunition found on or in close proximity to shooters body at Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541751 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows an interior at the Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541599 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows the exterior of the Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541601 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows damage done to the front entrance at Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541609 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows an interior at the Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541611 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows damage done to the front entrance at Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541615 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows damage done to the front entrance at Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541617 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows books at the suspect's house on Yogananda St. following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541753 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a Glock 20, 10mm found near the shooter in Room 10 at Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541757 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows documents at the suspect's house on Yogananda St. following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541759 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows documents at the suspect's house on Yogananda St. following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541761 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a rifle in the master bedroom in the suspect's house on Yogananda St. following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541763 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows documents at the suspect's house on Yogananda St. following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541783 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a bullet casing at Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541789 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows an interior at the Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. A second report was released December 27, 2013 by Connecticut State Attorney Stephen Sedensky III gave more details of the the Newtown school shooting that left 20 children and six women educators dead inside Sandy Hook Elementary School. (Photo by Connecticut State Police via Getty Images) ( 459541793 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows an interior at the Sandy Hook Elementary School following the December 14, 2012 shooting rampage, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541795 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a document seized following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541797 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a firearm seized from the suspects house following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541827 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a knife seized from the suspects house following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541829 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a knife seized from the suspects house following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541831 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a knife seized from the suspects house following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541833 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a firearm seized from the suspects house following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541835 )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows a knife seized from the suspects house following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541837 )

This photo released by the Connecticut State Police on Friday, Dec. 27, 2013, and contained in a document titled "Sec 4 -Scene Search Day 3," shows a room in the home where Adam Lanza lived with his mother in Newtown, Conn. Lanza gunned down 20 first-graders and six educators with a semi-automatic rifle at Sandy Hook Elementary School on Dec. 14, 2012, in Newtown, after killing his mother inside their home. Lanza committed suicide with a handgun as police arrived at the school. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

This Dec. 14, 2012 photo released by the Connecticut State Police shows what the evidence report describes as a view of a second floor bathroom and its contents including a photo identification of Adam Lanza and a cellular phone with battery removed, in the house where Adam Lanza lived with his mother in Newtown, Conn. The photo was released as part of the evidence gathered by police during their investigation after Adam Lanza gunned down 20 first-graders and six educators with a semi-automatic rifle at Sandy Hook Elementary School on Dec. 14, 2012, in Newtown. (AP Photo/Connecticut State Police) ( APTOPIX Connecticut School Shooting )

This photo released by the Connecticut State Police on Friday, Dec. 27, 2013, from a document titled "Sec 8 - Autopsy," shows evidence pertaining to the Dec. 14, 2012 shooting at Sandy Hook Elementary School in Newtown, Conn. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

This Dec. 14, 2012 photo released by the Connecticut State Police shows what the evidence report describes as a hard cover copy of "Amish Grace" found in the house where Adam Lanza lived with his mother in Newtown, Conn. The photo was released as part of the evidence gathered by police during their investigation after Adam Lanza gunned down 20 first-graders and six educators with a semi-automatic rifle at Sandy Hook Elementary School on Dec. 14, 2012, in Newtown. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

This evidence photo contained in a document titled "Sec 15 - Firearm Survey - Savage," in a report of an investigation released by the Connecticut State Police, Friday, Dec. 27, 2013, shows a weapon. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

This photo contained in a document titled "Sec 4 -Scene Search Day 3," in a report of an investigation released by the Connecticut State Police, Friday, Dec. 27, 2013, shows a scene at 36 Yogananda St., where Adam Lanza lived with his mother in Newtown, Conn. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

This Dec. 16, 2012 photo released by the Connecticut State Police shows what the evidence report describes as a "Volunteer Thank You Card" for Mrs. Lanza with a pamphlet for a 5th grade "Stepping Up Ceremony" dated June 10, 1999 at Sandy Hook Elementary School, found in the house where Adam Lanza lived with his mother in Newtown, Conn. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

This photo released by Connecticut State Police on Friday, Dec. 27, 2013, and contained in a document titled "Sec 4 -Scene Search Day 3," shows items from the home where Adam Lanza lived with his mother in Newtown, Conn. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

This photo released by the Connecticut State Police Friday on Dec. 27, 2013 and contained in a document titled "Sec 4 -Scene Search Day 3," shows a room from the home where Adam Lanza lived with his mother in Newtown, Conn. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

This evidence photo contained in a document titled "Sec 15 - Firearm Survey - Enfield," in a report of an investigation released by the Connecticut State Police, Friday, Dec. 27, 2013, shows a weapon. (AP Photo/Connecticut State Police) ( Connecticut School Shooting )

In this handout crime scene evidence photo provided by the Connecticut State Police, shows the suspect's house on Yogananda St. following the December 14, 2012 shooting rampage at Sandy Hook Elementary School, taken on an unspecified date in Newtown, Connecticut. (Photo by Connecticut State Police via Getty Images) ( 459541755 )