Saskatchewan Justice Minister Don Morgan says he knows who the Regina police suspect of leaking confidential documents about missing money from the NDP caucus, but he won't make it public.

Late last week, the Regina police wrapped up their investigation into police files taken from their offices.

The files, from 1992 and 1994, concerned a former New Democrat caucus employee who admitted she took about $6,000 in caucus funds she wasn't entitled to take. The reports also included references to NDP politicians and staffers who weren't accused of anything.

Release of the documents last year resulted in two police investigations: one into the missing money from 1992 and the other into the question of who took the police documents. Neither investigation resulted in charges.

Regina police said last week they think they have identified the person who took the reports — a former police officer who's been retired for a number of years. However, an Alberta prosecutor decided there wasn't enough evidence to lay criminal charges.

The documents were given to the then-opposition Saskatchewan Party in the spring of 2006. The Saskatchewan Party went public with the documents a year later, tabling them in the legislature and posting them online.

The leaked files were fodder for numerous fiery debates in the legislature, with the then-Opposition Saskatchewan Party suggesting the NDP wanted to cover up a crime, and the New Democrats accusing the Opposition of smearing them with innuendo over a 15-year-old incident.

Cabinet minister Glenn Hagel, who had been the NDP caucus chair in the early 1990s, temporarily stepped down from cabinet when the case was referred to the police. Hagel failed to be re-elected in the 2007 election.

The NDP was demanding Monday that the government say who gave the Saskatchewan Party the documents.

Justice Minister Don Morgan said that while he knows the name of the suspect, he won't release it.

"The practice in this province has been that once charges are laid, that's when the matter is made public," he said. "That's served us well and it wasn't something that I would contemplate to try to change now."

However, there's no good reason Morgan isn't making the name public, other than to protect himself and his party, NDP justice critic Frank Quennell said.

"I'm not sure the people of Saskatchewan believe that the members of the Saskatchewan Party are being entirely co-operative on this matter," Quennell said.