Papua New Guinea's Police Chief of Operations, Jim Andrews, says it is imperative that police re-look at the investigation into the Prime Minister's alleged role in illegal payments to the Paraka law firm.
The Police Commissioner Geoffrey Vaki has asked the district court to set aside the warrant of arrest against Peter O'Neill.
This follows the National Court decision ruling against Mr O'Neill's bid to stop the warrant from being implemented.
The Court ruled that the Commissioner has the constitutional duty to deal with the warrant.
Mr Andrews says that the Commissioner has to look into this matter and check whether the files are contaminated.
"It is a very, very serious issue that has been going on for quite a long time. But being the newly appointed Commissioner, he was not involved in this particular case, and he has the authority under those sections (of the constitution) to re-look into the whole investigation and the file."
PNG's police chief of operations, Jim Andrews.