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