Police were justified in using Tasers to stop three individuals self-harming, a watchdog has found.
During an incident in Lisburn last July, police deployed three of the stun guns after a man who admitted being high on substances threatened to jump from a first-floor window.
Witnesses reported that the man had broken into two houses and was armed with knives.
He was also seen smashing furniture and windows.
In September 2015, a Taser was used against a woman in Ballymena who was bleeding from her arms and held a knife to her throat.
Ombudsman investigators found that the woman had dialled 999 in a distressed state but had declined help from officers who attended the scene.
In another incident last November, a Taser was used when a man with drug problems, who had recently attempted to take his own life, locked himself in a bathroom and caused self-harm.
Police had been called to the property in north Belfast by a doctor.
Discharges of police firearms, including Tasers, are routinely referred by the chief constable for independent scrutiny.
Police Ombudsman Dr Michael Maguire said in each incident the use of a Taser had been lawful, justified and proportionate and had helped prevent those involved causing themselves more serious harm.