"Our investigations this far lead us to conclude that the shooting incidents were not random acts of violence against strangers,'' Mr Sutton says.
"Rather, they appear to have been planned and those involved - either as victims or the alleged offender - are most likely participants in the illicit drug business.''
Shootings occurred at Hayr Rd on November 13 and 27, at a Mt Albert address on December 8 and in Seymour St, St Mary's Bay, on December 19.
The 29-year-old will appear at Auckland District Court today charged with wounding with intent to cause grievous bodily harm and commission of a crime while in possession of a firearm in relation to the December 8 incident, during which a man was allegedly shot in the foot.