The psychiatrist for the prosecution, Dr. Harold Zolan, maintained that although DeFeo was an abuser of heroin and LSD, he had antisocial personality disorder and was aware of his actions at the time of the crime.
Anklagerens psykiater dr. Harold Zolan, fastholdt, at selv om DeFeo var misbruger af heroin og LSD og havde antisocial personlighedsforstyrrelse var han bevidst om sine handlinger på drabstidspunktet.