After stumbling out of the starting blocks, prosecutors in the murder trial of Robert “Chip” Olsen need to regain their footing.

They turn to a crucial witnesses — Olsen’s police academy instructor on the use of force. Will Sgt. J.K. Walker help shift the momentum back?

» LISTEN: Previous seasons of the AJC’s ‘Breakdown’ podcast 

» MORE: The latest on Anthony Hill and the Chip Olsen trial

Olsen had a Taser, pepper spray and a baton on his belt when he encountered Anthony Hill on March 9, 2015. But instead of using any of those non-lethal options the DeKalb County cop pulled his  gun.

Walker testifies that the county’s use of force policy provides guidance for what an officer should do.

But it also makes one principle clear: the value of human life is immeasurable.

“One of the department’s core value statements is the preservation of life,” Walker testifies. “Officers must exhaust every means available of non-lethal force prior to utilizing deadly force.”

Available Tuesday,  Episode 8 - “The State Strikes Back” takes listeners through some of the most important testimony so far.

You’ll also hear as attorneys make their final pitches to the jurors in closing arguments.

Breakdown Season 7: Judgment Call is hosted by AJC legal affairs writer, Bill Rankin. He’s joined by crime and public safety reporter, Christian Boone.

The AJC is partnering this season with WSB-Radio.

You can download the podcast from iTunesStitcherSpotify or your favorite podcasting platform. Or you can stream it on your computer in the player below.

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