METRO VANCOUVER — The Crown is seeking to appeal the acquittal of an RCMP officer who was charged with perjury for his testimony at the Robert Dziekanski inquiry, suggesting prosecutors were undeterred by a not-guilty verdict in the first of four trials linked to the case.

Const. Bill Bentley was among four officers who confronted Dziekanski at Vancouver's airport in October 2007, when the Polish immigrant was repeatedly stunned with a Taser and died.

All four officers were charged with perjury for their testimony at a subsequent public inquiry, held in 2009, where they were asked to explain alleged discrepancies between what they initially wrote in their notes and told investigators and what could be seen on an amateur video that emerged later.

The Crown argued at Bentley's trial that similar alleged discrepancies found in each officers' notes and police statements suggested they colluded on a story to tell investigators and then lied at the inquiry to cover up their collusion.

Bentley, who faced the first of four separate trials, was acquitted in July when a judge concluded there were other, more innocent explanations for the alleged discrepancies.

The acquittal raised immediate questions — which have so far gone unanswered — about how the Crown would proceed with the remaining three cases. Jury trials are currently scheduled for November, January and February, and the Crown has already said it plans to rely on the same theory and the same evidence in each of the remaining cases.

The special prosecutor handling the case has now filed an appeal of Bentley's acquittal, arguing the judge was wrong to reject the Crown's theory.

"The learned trial judge failed to apply the correct legal test in considering whether the evidence led by the Crown was sufficient to establish that the defendant colluded with his fellow RCMP officers prior to making his police notebook entries and providing certain statements to members of the integrated homicide investigation team," says a notice filed with the B.C. Court of Appeal, dated Aug. 28.

Special prosecutor Richard Peck is asking the Appeal Court to overturn Bentley's conviction and order a new trial. Peck declined to comment Thursday.

Bentley's lawyer could not immediately be reached for comment.

At Bentley's trial, the Crown presented the police notebooks and statements of each of the four officers. Prosecutors argued there were several instances in which all or several of the officers made the same errors when compared with the video.

For example, Bentley wrote in his notes and told a homicide investigator that Dziekanski grabbed a stapler and came at the officers screaming before he was stunned. He also said two officers wrestled Dziekanski to the ground.

On the video, Dziekanski can be clearly seen falling to the ground after the first Taser jolt. It's not apparent from the video what Dziekanski did once he grabbed a stapler from a nearby desk, as his back was to the camera and the desk partially blocked the camera's view.

The defence argued any errors in Bentley's notes or police statements were innocent mistakes that were the product of a fast-moving, stressful situation.