Alfred Sasako, an Opposition MP in Solomon Islands, says the Amnesty International report shows the need for the UN to be more involved in the country.
Amnesty says continuing violence and intimidation on the Weather Coast is undermining the chances of improving law and order in the country.
Mr Sasako says the UNDP project now underway to demoblize the special constables is just scratching the surface.
He says a UN led team could investigate the abuses and then capture Harold Keke.
"Because as long as Solomon Islands police continue to hunt him down, I don't believe that they would capture him, and that doing so would only deepen the wounds that people would like to forget."