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It's common practice in the US to not be under arrest until there is evidence. What would have happened here is an officer(s) would interrogate the suspect while other officers obtain a search warrant from a judge. The search would be conducted while the suspect was being questioned. If the suspect refused to cooperate, they would be arrested on suspicion of some minor crime. When more evidence is found, the major crimes would be charged.
Was the motivation behind the killings revealed?
I've got a friend in NZ right now. I'll have to see what they know.
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