Just when you thought you knew everything there was to know about Steve McNair, Channel 4 has learned exclusively that McNair was a sworn police officer in a rural Mississippi town. Less than six months before his death, McNair signed his name and took an oath to become a police officer in the city of Greenville, Miss., on Jan. 28, 2009.Greenville is more than 150 miles away from McNair's childhood hometown of Mount Olive, Miss., and even further from the former Tennessee Titan's home in Nashville.On Thursday, Greenville Police Chief Charles Patterson told Channel 4 by phone that McNair was supposed to enter the police academy July 6, 2009, just two days after Metro police said his mistress, Sahel Kazemi, killed McNair and then herself inside his downtown condo.This new information is something Metro police never publicly mentioned, but in the more than 200-page case file report is a document showing that police recovered a 9-mm Glock, a holster, handcuffs and a Greenville, Miss., police badge and ID.All this property was turned over to McNair's wife in November of last year."I think it's huge in many aspects," said Vincent Hill, a former Metro traffic officer who has self-published a book on his doubts in the case.Hill said he wonders why McNair's law-enforcement background was never made public."It would also make one question if a gun was already at the scene which Sahel had knowledge of, which I know firsthand, she had knowledge of, would she really go out and purchase a gun if her end result was to kill herself and Steve McNair?" Hill said.The Greenville police chief wants his department's property back and said he wonders why, if Metro recovered a badge, they haven't called him yet.Patterson also said he's in the process of contacting an investigator at Metro to find out how he can get his department's gun, badge and ID back.Patterson said he was good friends with McNair and that he had always had an interest in law enforcement. McNair used to ride along with him in his earlier years as a Mississippi state trooper, he said.Patterson also indicated that this position was not about money for McNair but rather a way to dedicate his service to kids in the community.Patterson also said that he didn't anticipate McNair would serve in a full-time capacity but rather it would be a part-time, volunteer position.McNair wasn't certified but would have been certified after completing the police academy.