Prosecutors built their case Thursday against actor Alec Baldwin, who is on trial in New Mexico, accused of involuntary manslaughter in the on-set shooting death of cinematographer Halyna Hutchins.

Baldwin's defense attorney questioned a crime scene technician over what he suggested were shoddy and subpar searches for the live ammunition that ended up in the actor's revolver and killed cinematographer Halyna Hutchins.

On the second day of Baldwin's New Mexico involuntary manslaughter trial, Judge Mary Marlowe Sommer sided with the prosecution on Thursday in letting in key statements from the actor that demonstrate his knowledge of guns and the impact of blanks.

Earlier, Alex Spiro grilled Santa Fe County sheriff's technician Marissa Poppell in particular over search warrants served on a prop truck a week after the death of Hutchins on the set of the movie "Rust," and on a prop warehouse more than a month after her shooting.

The questions eventually led to Spiro asking Poppell whether police and prosecutors "were just trying to get this over with so that prosecutors could focus on Alec Baldwin?"

"No," she answered.

In assertions that would be hotly disputed and dismissed by the prosecution, defense questioning mostly centered on the searches of Seth Kenney's warehouse and a prop truck where his guns were kept in a safe. He is an Albuquerque-based ammunition and weapons supplier to "Rust," who forged a cooperative relationship with investigators in the immediate aftermath of the fatal shooting.

Spiro suggested that relationship may have been too close.

"There was a witness there who assisted in the search," Spiro said when asking about the warrant served on the truck. "A man named Seth Kenney. And not only did he assist, he actually was the one that opened the safe."

"Yes, he had the combination to it," Poppell said.

Spiro asked, "Why did law enforcement wait a week to go to the prop truck?"

"The search warrant needed to be written," Poppell replied. "I'm not sure why the time difference exactly."

Spiro responded that a search warrant for the church building set where the shooting took place was obtained in a day.

"If you can do a search warrant in one day for one thing why does it take seven days for something else?"

Spiro asked Poppell, who found a half-dozen live rounds on the set, if she was surprised to find none in the truck.

"Not necessarily," she said.

"You're finding these live rounds all over the set, right?" Spiro asked. Poppell replied yes.

"You go a week later to the prop truck, which has all the ammunition right?" Spiro asked. "And there's not a single live round there, right?"

Poppell replied "yes" to both.

"Let me ask you something," the attorney said eventually. "At any point did you become suspicious of Seth Kenney?"

Poppell answered, "No."

Kenney has not been charged with any wrongdoing. An email sent to his attorney seeking comment was not immediately returned.

Special prosecutor Kari Morrissey in her redirect questioning of Poppell sought to render irrelevant the defendant's approach by asking whether Alec Baldwin was charged with involuntary manslaughter because he brought live rounds onto the set or loaded them into his gun. Poppell answered "no" to both.

Poppell agreed there was evidence that Hannah Gutierrez-Reed — the film's armorer who has already been convicted of involuntary manslaughter in the shooting — had brought the ammunition, which she said was given to her by her father.

Morrissey's defense of Kenney's role extended into her questioning of the case's lead detective, sheriff's Cpl. Alexandria Hancock, who testified briefly at the end of the day and will likely be on the stand for much of Friday.

"Did you ever discover any evidence throughout your entire investigation that Seth Kenney supplied live rounds to the set of 'Rust?'" Morrissey asked. Hancock said no.

The prosecution was especially contemptuous of defense questions to Poppell about bullets brought into the sheriff's department after the Gutierrez-Reed trial earlier this year by a good Samaritan who said the ammunition was the source of the round that killed Hutchins and that Kenney had duped authorities.

Spiro said that Poppell had "buried" this evidence and it had not been shared with the defense in either Baldwin's case or that of Gutierrez-Reed.

Morrissey established in her questioning that the source of the ammunition was Troy Teske, a friend of Gutierrez-Reed's father, and despite similarities was not the same size as the live rounds found on the "Rust" set, including the one that killed Hutchins.

"The ammunition that the good Samaritan Mr. Teske, close friend of Hannah Gutierrez's dad, brought to you after her conviction do you still have it?"

Poppell replied yes.

"You could bring it in here and show it to the jury and they could see for themselves that it does not match the live ammunition from the set of 'Rust?'"

Yes, the technician answered.

Spiro got Poppell to testify that it could be very difficult to tell the difference between dummy rounds made to appear as onscreen ammunition that were used on the set, and the live rounds that turned the set fatal.

It was an attempt to push back against the key assertion of prosecutors' case: that Baldwin recklessly flouted gun safety.

Gutierrez-Reed — who has already been convicted of involuntary manslaughter in the shooting — plead the fifth if called to testify in the trial her attorney told CBS News on Thursday.

Both the prosecution and the defense completed their opening statements Wednesday in the Santa Fe courtroom of Judge Mary Marlowe Sommer, who also oversaw the trial of the film's armorer, Hannah Gutierrez-Reed. Gutierrez-Reed was convicted of involuntary manslaughter and sentenced to 18 months' imprisonment earlier this year.

The case stems from the 2021 on-set shooting of Hutchins, who died at the hospital after being shot with a .45-caliber revolver held by Baldwin in a small church on Bonanza Creek Ranch, a popular filming location near Santa Fe, during a rehearsal. 

Baldwin, who has pleaded not guilty, has said he pulled the hammer but did not pull the trigger.

Thursday's testimony is expected to begin with the defense cross-examination of Marissa Poppell, a crime scene technician who photographed evidence, the fourth law enforcement witness called by prosecutors as they argue the movie set was an unsafe work environment where safety rules were ignored, including and encouraged by Baldwin. The defense argued in its opening statement that Baldwin was on-set as an actor, and it was the armorer who loaded the gun, not Baldwin.

Baldwin, who was joined in the courtroom Wednesday by his wife, Hilaria Baldwin; his brother, actor Stephen Baldwin; and his sister Beth Keuchler, is expected to be in the courtroom each day of the trial, which is scheduled through July 19. Trial is expected to resume Thursday at 8:30 a.m. MDT, 10:30 EDT, with breaks at 10:30 a.m. local time, for lunch, and again at 3:30 p.m. local time.

Elise Preston, Kathleen Seccombe and Elizabeth Campbell contributed to this report.

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