Deaths in police custody are rare and traumatic events. The use of Tasers in the present case adds a further element to the chain of events.
Since their introduction in 2010 after a trail three years earlier, Tasers have become commonplace. Last year 7500 frontline officers were trained in their use, up from 5500 in 2015.
Statistics gathered by the police indicate that in 2016 the devices were pointed at targets six times more than they were fired. In 2015 the ratio was seven to one and in 2014 it was eight to one.
Police are more likely to discharge tasers when dealing with mentally ill people. The 2017 Tactical Options Research Report found that ratio of presenting the weapon to firing it towards people with mental distress was four to one.
It is likely that people with mental disorders may become more agitated and belligerent when challenged by police, which in turn may make it more likely the weapon will be drawn and possibly discharged.
This in turn creates an issue with Tasers in these cases as the effect of the weapon on people with mental health issues may be different than when a fit, healthy individual is hit by the electric darts.
These circumstances require well-trained officers to achieve the best possible outcomes.
Police guidelines regarding the use of Tasers indicate they can be used lawfully when officers fear imminent physical harm to themselves or others. The guidelines say the "necessary, proportionate and reasonable" use is a matter of careful judgment by the officers.
The Tactical Options report noted that of 18 complaints involving Tasers in 2016 and reviewed by the IPCA, 4 were upheld and led to disciplinary or corrective action, or a policy change. The numbers are not high, but nevertheless indicate that Taser use needs careful monitoring.
The Auckland tragedy is a timely opportunity to review whether police are exercising careful judgment.