The treatment of women in New Zealand's prisons has outraged a criminologist at Oxford University.
Last year RNZ reported that as well as using regular pepper spray, Corrections use an American product called Cell Buster to hose pepper spray into cells.
It's even been used on inmates who have asthma.
Dr Sharon Shalev, a UK-based expert on solitary confinement who has extensively researched prisons, was asked by the Human Rights Commission to review the three women's prisons here.
Dr Shalev spoke to Susie Ferguson.
