Illinois

If you've heard audio of the Chicago police shooting, experts say your ears have been deceived

FILE - In this Oct. 20, 2014 frame from dash-cam video provided by the Chicago Police Department, Laquan McDonald, right, walks down the street moments before being shot by officer Jason Van Dyke in Chicago. Van Dyke, who shot McDonald 16 times, was charged with first-degree murder Tuesday, Nov. 24, 2015. The video has no sound, nor do videos from four other squad cars at the scene. But police protocol indicates that all the cruisers should have been recording audio that night. (Chicago Police Department via AP, File)

FILE - In this Oct. 20, 2014 frame from dash-cam video provided by the Chicago Police Department, Laquan McDonald, right, walks down the street moments before being shot by officer Jason Van Dyke in Chicago. Van Dyke, who shot McDonald 16 times, was charged with first-degree murder Tuesday, Nov. 24, 2015. The video has no sound, nor do videos from four other squad cars at the scene. But police protocol indicates that all the cruisers should have been recording audio that night. (Chicago Police Department via AP, File)  (The Associated Press)

Hours after Chicago officials released audio-free dashcam video of a white officer shooting a black teen 16 times, a 35-second excerpt with sound appeared online. But experts, police and an Associated Press analysis have concluded the audio is bogus.

In it, viewers can see and supposedly hear Officer Jason Van Dyke firing nine rapid shots at Laquan McDonald, then pausing and firing again.

This video garnered nearly half a million social media views. It added fuel to simmering suspicions police were covering something up about the 2014 shooting. Van Dyke has now been charged with first-degree murder.

Ed Primeau is an expert who's on the executive committee of the American Board of Recorded Evidence. He says the video's clearly fake. Among other things, he cites gunshots that don't reverberate as they should if authentic.