These concerns follow on from the death of 23-year-old Junior Togatuki, which highlighted issues about their treatment and the policy itself.
Togatuki took his own life in Goulburn's Supermax prison. Earlier, he had begged Immigration Minister Peter Dutton to be allowed to remain in Australia.
His death raised further questions over aspects of these centres, most notably access to medical care and lawyers. He suffered from schizophrenia and anxiety, conditions that must have been known to the authorities.
There is a view that "if you can't do the time, then don't do the crime". That's fair. Kiwis who relocate to Australia need to abide by the laws of that country and should accept the consequences of their actions.
However, the act of placing Kiwis in detention camps has placed a serious strain on the special relationship between our countries.
Mr Davis' venture might be doomed to fail but his quest to gather more information is appropriate.