One year ago, a 20-year-old gunman shot his way through the front office and into two first-grade classrooms at Sandy Hook Elementary School in Newtown, Conn., killing six adults and 20 children. Then he killed himself.
Advocates for the mentally ill say the USA has made fitful progress in the year since the shootings at Sandy Hook Elementary School turned the country's attention to failures in the mental health system.
In the six months since the Sandy Hook Elementary School shootings, lawmakers in four key states have approved significant restrictions on access to firearms. But elsewhere in the USA, the picture is far from clear.