Yes, back to facts, PS stalked and harassed women and had to be told to stop by 2 that we know of, one applied for an AVO.
The recording might be inadmissible in court but if the suspect led police to where the child is, alive or dead, the mission is accomplished. We have to remember that was GJ first thought and priority. GJ wasn't using the recordings for some perverted and ghoulish reasons, he acted, he thought, under operational standards, we'll see if the court agrees.
Re PS: GJ found PS to be untruthful and irritable, he decided the conversations needed to be recorded for reasons he stated. PS is not on trial but I'll challenge anyone who minimises stalking and harassment with a long laundry list of excuses. IIRC, I read earlier posts from yourself implying the postie was exaggerating or lying. She had a job to do and PS won't take no for an answer.