Court Watch, an all-volunteer, non-profit organization that fights domestic violence has released a study called "Abusers with Guns: The Critical Role of Maryland’s Courts in Reducing Lethal Risks to Domestic Violence Victims".
The research indicated that judges told only 1 out of 126 convicted domestic violence offenders they were banned from possessing or purchasing guns even though studies support that when an abuser has access to a gun the chances of a victim being killed rises 500%.
Read the complete study (pdf).