BALTIMORE (AP) - The chief of staff to the commissioner of the Baltimore Police Department is testifying that six updated policies were sent to all agency members just days before the arrest of Freddie Gray.

One of the updates required officers to buckle all detainees in seat belts and to obtain medical care for them "when necessary or requested."

Prosecutors say Officer William Porter is partially responsible for Gray's death because he didn't buckle the man in a seatbelt and failed to call a medic despite Gray's repeated requests.

Capt. Martin Bartness said the updated orders replaced a previous policy from 1997. That policy provided officers with slightly more leeway, instructing them to buckle detainees in seat belts but to prioritize their own safety. The new order leaves no ambiguity. Bartness read the policy aloud.

Like this story? Like WUSA9 on Facebook

PREVIOUS STORIES:

Prosecutor: Baltimore cop "responsible" for Freddie Gray death

Judge reveals 200 potential witnesses in Freddie Gray case

Officer's lawyers want Freddie Gray jury to be sequestered