WA Police Commissioner Karl O'Callaghan has again lobbied to lower the threshold for children to be taken away from extremely dysfunctional families, labelling claims he was advocating for another stolen generation as "bullshit".

Speaking on Radio 6PR on Monday, the state's top cop said there were around 100 families in the Perth metropolitan area that needed significant wrap-around services and support to give the children any hope of a "normal life".

WA Police Commissioner Karl O'Callaghan has called for the threshold to remove children from dysfunctional families to be lowered.

"I don't buy this bullshit about the stolen generation," he said.

"Every time I've come out in the paper over the last few years and said we should lower the threshold, some of the most prominent people around Perth jump up and say you're advocating another stolen generation.