Markingson was acutely psychotic when he was placed under an involuntary commitment order that legally compelled him to obey the treatment recommendations of his psychiatrist, Dr. Stephen Olson.

CNN: Bring medical misdeeds into the light

To get the certificate, a buyer would need to be fingerprinted, take a firearms training course and undergo a national criminal background check and involuntary commitment or voluntary admission check.

NPR: Conn. Reaches Deal On Tough Gun Laws After Newtown

Late Tuesday, Assembly Speaker Sheldon Silver, the leader of the Democrat-led Assembly, said the gun-control negotiations also included talks on strengthening Kendra's Law, a 1999 law that requires people court-ordered to undergo psychiatric treatment to comply with that treatment or risk a period of involuntary commitment.

WSJ: Cuomo Seeks Overhaul

He announced in an October 2005 press release that every sexually violent predator in state custody would be evaluated for involuntary civil commitment once that person was released from prison.

WSJ: NY court denies officials immunity in prison case

Segal at the University of California, Berkeley, "Civil Commitment Law, Mental Health Services, and U.S. Homicide Rates, " found that a third of the state-to-state variation in homicide rates was attributable to the strength or weakness of involuntary civil-commitment laws.

WSJ: David Kopel: Guns, Mental Illness and Newtown

If, in the wake of the lessons of the war with Iraq, the American people are to have an alternative to their present, involuntary and absolute exposure to weapons of mass destruction, they must demand from their government a commitment to public survival and an investment in the myriad defensive technologies and equipment needed to honor that commitment.

CENTERFORSECURITYPOLICY: End Madness of Planned Vulnerability