TULSA, Oklahoma - Tulsa Mayor Dewey Bartlett on Wednesday announced he signed an executive order on a practice some believe involves "buying rank" in the Tulsa Police Department.

The order requires certain city employees including officers to sign an affidavit whenever a promotion or appointment is offered to that employee.

By signing it, the employee swears under oath they haven't received anything for the promotion.

News On 6, along with our partners at The Frontier, broke the story on the practice of officers eligible for promotions paying higher ranking officers to retire early.

During our investigation, a 35-year officer said there's nothing "morally wrong" with it, saying, "Who's the victim? Two people get together and make a financial arrangement."

He went on to say, "I don't know how you'd prevent it. You'd have to tear up our whole system."

3/16/2016 Related Story: Tulsa Police: Decades-Long Practice Of Buying Rank

6/3/2016 Related Story: Mayor: Tulsa Police Practice Of Buying Rank Will Stop

Tess Maune will have more on this story at 6 p.m.

A copy of the mayor's executive order: