TULSA, Oklahoma - Prosecutors are calling more witnesses as they build their case in Betty Shelby's manslaughter trial. 

Six more witnesses were called to the stand Thursday morning and three of those were the detectives working the scene the night of the shooting. That makes 12 witnesses called by the district attorney so far. 

Detectives typically come to the scene after the incident, after the scene has been secured and taped off basically, they show up after everything has calmed down.

On the night of September 16, 2016, they got there about half an hour after Officer Betty Shelby shot Terence Crutcher.

At that point, Shelby was preparing to leave the scene and head back to the police department.

The detectives took pictures of the scene and Thursday, the jury and those in the courtroom saw about 45 of those pictures.

The pictures were taken from just about every possible angle and included pictures of the car, pictures of a pack of cigarettes and pictures of Crutcher's identification.

After pictures are taken, the detectives take video of the scene, measure the evidence and then collect it.

Describing this process in the courtroom helped set the scene for the jury, so prosecutors could start presenting any evidence that was significant. So Thursday morning's witnesses were mostly a set up for that.

Calling those witnesses allows the DA to get that evidence admitted, Taser on the ground and a shell casing, Taser barbs in the pants and shirt of Crutcher still at the scene, and the bullet fragment removed from Terence Crutcher at the medical examiner's office. 

The photos also showed the rolled down windows of the vehicle and the vial of PCP found inside it. 

The last officer to testify took pictures of Crutcher's vehicle once it was in secure storage, once again showing the windows were halfway down, like at the scene. 

The photos also showed some school books in the vehicle and again, no weapons. The crime scene detective testified he was also instructed to take a swab from the driver's side window. 

He said he dropped the first swab and couldn't use it, so took two more, a wet sample and a dry sample. 

Tulsa Police Cpl. Wyatt Poth was the supervisor on duty the night of the Crutcher shooting, and when called to the stand, Poth testified he saw Shelby at the scene and told her "not to say a word." He said he did that to preserve her rights. 

Poth said he knew there would be "a group of people" upset about the shooting, "simply because of the color of somebody's skin. 

There was unrest in the courtroom when Poth made that statement.

He said he has told other suspects in other crimes, the same thing to preserve their rights.

Lori Fullbright will have a full update at 5 p.m. on News On 6.