Due to a court order, authorities released some of the surveillance footage in the Parkland, Florida school shooting.
Cruz, 19, has been charged with 17 counts of premeditated murder in the first-degree and 17 counts of attempted murder in the first-degree.
But the edited 27-minute video that was released Thursday illuminates little.
Florida's Broward County Sheriff's Office has released surveillance video showing the actions of the Marjory Stoneman Douglas High School resource officer shortly after the first shots were fired on campus last month.
His account seems to be contradicted by the 911 dispatch tapes released by the Broward Sheriff's Office last week. BSO policy calls for deputies to engage an active shooter and eliminate the threat, but does not explicitly say an officer "must" enter a building.
Sheriff Scott Israel was sickened by his disgraceful deputy
The arraignment occurred against the backdrop of widespread student rallies against gun violence nationwide, and it came a day after prosecutors said they would seek a death sentence for Nikolas Cruz, who police say returned to his former school on February 14 and fired round after round at students and faculty alike.
During the six-minute shooting, as Nikolas Cruz turned classrooms into deadly chaos, Peterson hardly moved, and he never entered the building. He was suspended and resigned, but is still under investigation. It is hard to tell from the video if Mr Peterson is actually in the clip at times, as the figures are indistinguishable in the upper corner of the shot.
Peterson's attorney, Joseph DiRuzzo, did not immediately respond to a request for comment. The video allegedly shows Peterson reach building 12 roughly 90 seconds after the attack began. Other officers show up, though it is not clear from the video whether they are BSO or Coral Springs officers, and students are eventually led out of the building. Tens of thousands of students protested and demonstrated at schools and in public places across the country. They then drive away in a golf cart.
Phil Keating reported the details on "Outnumbered Overtime" Thursday.
The media organisations said the public had a right to see the videos under Florida's public record law.
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