to explain. >> antonio, it turns out the dash cam video that recorded jason van dyke shooting la kwan mcdonald did not have audio. 16 shots into 17-year-old la kwan mcdonald a year and a half ago, resulted in a first degree murder charge from van dyke. noticeably absent from the recording, sound, even though it's supposed to have it. on friday van dyke's attorney vehemently denied hiss client tampered with the audioo audio s vehicle. >> more important, audio in this case would be beneficial to us. >> the mcdonald video isn't the only chicago police video, missing audio. police shooting flint farmer in 2011 are also silent, neither of the sisters involved in those shootings were charged. the chicago police department admits it has a big problem with malfurnishingsing dash cam equipment. it recently said about 10% of video cameras have audio problems and 20% don't record audio properly. a log from one squad car said karmics were not synchronized from the system or were intentionally defeated. plairts intentionally failed to sync mics. la kwan's family demanded a federal investigation. >> these p

out that dash cam video that recorded chicago police officer jason van dyke firing shots into la kwan mcdonald didn't have audio for a reason but the question was was that microphone attached to the dash cam video turned off or did it malfunction? this troaive controversial video resulted in a first degree murder charge against van dyke. noticeably absent from the recording, sound. even though it's supposed to have it. on friday van dyke's attorney vehemently denied his client tampered with the microphone on his dash cam. >> if this audio was tampered with, then it was tampered with by somebody other than jason van dyke. this car was not van dyke's car, he was not assigned to this car and audio would have been beneficial to us. >> other videos are also silent. neither of the officers involved in those shootings were charged. the chicago police department admits it has a big problem with malfunctioning dash cam equipment. it recently said about 10% ever dash cam cameras had maintenance problems and operator error is also a problem. a log from one quad ca quad squd mitigatiomiksmics were not pro