TORONTO - The criminal conviction of a Toronto police officer for assaulting a protester during the G20 summit three years ago was hailed as a victory for the hundreds of demonstrators who were rounded up and arrested that weekend.

Const. Babak Andalib-Goortani was convicted Thursday of assault with a weapon after a judge found he used excessive force during the arrest of protester Adam Nobody on June 26, 2010, on the lawn of the Ontario legislature.

Andalib-Goortani didn't need to forcefully jab Nobody with his baton several times as his fellow officers were trying to cuff the man, Ontario Superior Court Judge Louise Botham found.

"A police officer is not entitled to use unlimited force to affect an arrest," she said.

Video footage of Nobody's arrest shows him on the ground with officers piled on top of him. Moments before Andalib-Goortani delivers his second set of blows, another officer can be seen kneeing Nobody in the face, Botham said.

"I accept that in a dynamic situation, arrests need to occur quickly and officers may well need to use force to ensure that happens...(but) even on the defendant's evidence the resistance offered by Adam Nobody was minimal," Botham said.

"(Andalib-Goortani's) explanation that he was responding to Adam Nobody's resistance is nothing more than an after the fact attempt to justify his blows."

Nobody clapped as the verdict was announced, but said later that though he was pleased, he was surprised, as police are not often found guilty of criminal offences.

"Hopefully this helps vindicate the 1,100 people that were arrested and forced upon that day, including myself," Nobody said outside court.

"It's just a great feeling after three years...Justice is served and officers, you know, they can't get away with stuff like this. They can't attack citizens and it just feels really great right now. I'm elated."

More than 1,000 people were detained by police that weekend after protesters using so-called Black Bloc tactics broke away from a peaceful rally and ran through the downtown, smashing windows and burning police cruisers.

The vast majority of those detained were released without charge within 24 hours.

Andalib-Goortani was one of two officers to face criminal charges stemming from the arrests, but earlier this year Const. Glenn Weddell was acquitted.

Assault with a weapon carries a maximum sentence of 10 years, though it's unlikely Andalib-Goortani would see such a sentence. A sentencing hearing is scheduled for Nov. 8. For the moment, Andalib-Goortani is on restricted duties.

Toronto Police Association president Mike McCormack said outside court that Andalib-Goortani may appeal.

"He's very distraught and again, very crushed by this decision," McCormack said.

"We do stand by the system, we've always stated that position, but in this case we just feel that the judge came up with the wrong conclusion."

McCormack called Nobody's arrest an "isolated incident."

"I think that our members, our police officers, did a great job overall the day of the G20 and they're extraordinary circumstances and I still stand by our membership and that every officer's actions have to be assessed on their individual actions," he said.

Andalib-Goortani remains on "restricted administrative duties" following his conviction, Const. Victor Kwong, a Toronto police spokesman, said Thursday afternoon.

Kwong said Andalib-Goortani faces a hearing in February 2014 on a Police Services Act charge of assault with a weapon.

He also faces a second criminal charge of assault with a weapon, which is set to go to trial Feb. 10, 2014.

After the G20 summit some protesters said they couldn't file complaints against individual officers because they had no identification on their uniforms.

In her judgment, Botham called it curious that Andalib-Goortani did not have a name tag or badge number on his uniform in the videos of Nobody's arrest. She also called it "surprising" that fellow officers who testified for the defence had such a "vivid recollection" of Nobody's behaviour that day, three years ago, among a crowd of thousands.

"I am troubled by the fact that, although they all now identify Adam Nobody as a significant and memorable troublemaker, none of these senior officers recorded anything in their notes about him that day," she said.

Nobody was clearly verbally confrontational to police that day, Botham found, and while the officers may have perceived him as more aggressive than Nobody believes he was, he was not quite the rabble rouser the defence made him out to be, she said.

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  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 26: Demonstrators protest against the G8/G20 summits June 26, 2010 in Toronto, Canada. Store windows were smashed and a police car set on fire during the protest which was one of several planned in the city to coincide with the gathering of world leaders for the G20 and G8 summits being held in Toronto and nearby Muskoka June 25-27. (Photo by Scott Olson/Getty Images)

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    TORONTO, ON - JUNE 26: A couple kiss in front of the police line during a protest against the G20 summit June 26, 2010 in Toronto, Canada. The kiss was interupted as police charged protestors. Earlier in the day store windows were smashed and a police car was set on fire during the protest which was one of several planned in the city to coincide with the gathering of world leaders for the G20 and G8 summits being held in Toronto and nearby Muskoka June 25-27. (Photo by Scott Olson/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 26: A young anti-G20 protester carries her message on her chest as other demonstrators smash and loot their way through downtown June 26, 2010 in Toronto, Canada. Violent protesters burned police cars, smashed shop fronts and confronted the force of approximately 20,000 police who were charged with keeping order during the first day of the G20 Summit. (Photo by Simon Hayter/Getty Images)

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    TORONTO, ON - JUNE 27: Police officers chase demonstrators during the G20 summits June 27, 2010 in Toronto, Canada. Police have been making many arrests during the protests including many journalists during this final day of the G20 summit. (Photo by Scott Olson/Getty Images)

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    Protesters smash police vehicles in the Toronto's downtown core June 26, 2010 after a small group of anarchists broke from the main anti G20 demonstration and began a destructive march through the downtown. Ten thousand people marched against the G20 summit Saturday to protest for jobs and social causes, in a largely peacefully rally that saw nevertheless saw outbreaks of violence on its fringes. While the main body of the march was a well-marshaled event, led by older activists and organized labor, small groups of young hardliners scuffled with riot officers and set fire to at least two patrol cars. AFP PHOTO / GEOFF ROBINS (Photo credit should read GEOFF ROBINS/AFP/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 26: Violent anti-G20 protesters, using Black Bloc tactics, jump on a police car downtown June 26, 2010 in Toronto, Canada. Violent protesters burned police cars, smashed shop fronts and confronted the force of approximately 20,000 police who were charged with keeping order during the first day of the G20 Summit. (Photo by Simon Hayter/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 26: A police car burns after violent anti-G20 protesters, using Black Bloc tactics, smashed their way through downtown streets June 26, 2010 in Toronto, Canada. Violent protesters burned police cars, smashed shop fronts and confronted the force of approximately 20,000 police who were charged with keeping order during the first day of the G20 Summit. (Photo by Simon Hayter/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO - JUNE 25: A demonstrator drops his pants, taunting police in riot gear during a march near the campus of the University of Toronto on the eve of the G20 Summit June 25, 2010 in Toronto, Ontario, Canada. The protests come amid heavy police presence as G8 world leaders met today, with G20 finance ministers meeting tomorrow. (Photo by Chip Somodevilla/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 27: Toronto police officers step aside to allow a street car operator to move a street car out of the protest zone as police prepared to face protestors during a protest at the corner of Queen street and Spidina avenue on June 27, 2010 in Toronto, Canada. Hundreds of people, including journalists, were arrested by police in downtown Toronto during the G20 Summit and many were released prior to the 24-hour limit at which time they had to be charged with a crime. (Photo by Jemal Countess/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 27: Protestors face off with Toronto police officers during a protest at the corner of Queen street and Spidina avenue on June 27, 2010 in Toronto, Canada. Hundreds of people, including journalists, were arrested by police in downtown Toronto during the G20 Summit and many were released prior to the 24-hour limit at which time they had to be charged with a crime. (Photo by Jemal Countess/Getty Images)

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  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 27: Protesters hold a vigil outside the temporary detention centre where hundreds of anti-G20 demonstrators and others were being held and processed June 27, 2010 in Toronto, Canada. Hundreds of people, including journalists, were arrested by police in downtown Toronto during the G20 Summit and many were released prior to the 24-hour limit at which time they had to be charged with a crime. (Photo by Simon Hayter/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO - JUNE 27: Police attempt to clear protestors and make several arrests at a rally outside the temporary G20 police detention center, where over 500 people are now being detained on June 27, 2010 in Toronto, Ontario, Canada. Police are ramping up arrests across the city after widespread violence and vandalism plagued the city on the first day of G20 Summit. Burned police cars, smashed shop fronts confronted the force of approximately 20,000 police who were charged with keeping order. (Photo by Simon Hayter/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO - JUNE 27: Police attempt to clear protestors and make several arrests at a rally outside the temporary G20 police detention center, where over 500 people are now being detained on June 27, 2010 in Toronto, Ontario, Canada. Police are ramping up arrests across the city after widespread violence and vandalism plagued the city on the first day of G20 Summit. Burned police cars, smashed shop fronts confronted the force of approximately 20,000 police who were charged with keeping order. (Photo by Simon Hayter/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 27: Police use smoke bombs to disperse protestors at a rally outside the temporary G20 police detention center, where over 500 people are now being detained on June 27, 2010 in Toronto, Ontario, Canada. Police are ramping up arrests across the city after widespread violence and vandalism plagued the city on the first day of G20 Summit. Burned police cars, smashed shop fronts confronted the force of approximately 20,000 police who were charged with keeping order. (Photo by Jemal Countess/Getty Images)

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    TORONTO, ON - JUNE 26: A protestor destoys a poster of Justin Bieber during a demonstration against the G8/G20 summits June 26, 2010 in Toronto, Ontario Canada. Store windows were smashed and a police car set on fire during the protest which was one of several planned in the city to coincide with the gathering of world leaders for the G20 and G8 summits being held in Toronto and nearby Muskoka June 25-27. (Photo by Scott Olson/Getty Images)

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    Police stand ready with weapons as the confront protesters during the G8/G20 June 26, 2010 in Toronto. Dozens of protesters were arrested. Some 30,000 people, according to rally organizers, marched against the G20 summit Saturday demonstrating in favor of social causes, in a largely peacefully rally until violence erupted on its fringes. The main body of the march was a well-marshaled event, led by older activists and organized labor, but splinter groups of young hardliners scuffled with riot officers and set fire to three patrol cars. AFP PHOTO /DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)

  • Demonstrators Protest The G20 Summit

    Protesters smash police vehicles in the Toronto's downtown core June 26, 2010 after a small group of anarchists broke from the main anti G20 demonstration and began a destructive march through the downtown. Ten thousand people marched against the G20 summit Saturday to protest for jobs and social causes, in a largely peacefully rally that saw nevertheless saw outbreaks of violence on its fringes. While the main body of the march was a well-marshaled event, led by older activists and organized labor, small groups of young hardliners scuffled with riot officers and set fire to at least two patrol cars. AFP PHOTO / GEOFF ROBINS (Photo credit should read GEOFF ROBINS/AFP/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 26: A shattered glass-plate window cascades down as violent anti-G20 protesters, using Black Bloc tactics, smash and loot their way through downtown June 26, 2010 in Toronto, Canada. Violent protesters burned police cars, smashed shop fronts and confronted the force of approximately 20,000 police who were charged with keeping order during the first day of the G20 Summit. (Photo by Simon Hayter/Getty Images)

  • Demonstrators Protest The G20 Summit

    TORONTO, ON - JUNE 26: Police officers push back and use their battons to strike demonstrators protesting the G8/G20 summits on June 26, 2010 in Toronto, Ontario Canada. Store windows were smashed and a police car set on fire during the protest which was one of several planned in the city to coincide with the gathering of world leaders for the G20 and G8 summits being held in Toronto and nearby Muskoka from June 25-27. (Photo by Scott Olson/Getty Images)

  • Demonstrators Protest The G20 Summit

    Protesters smash police vehicles in the Toronto's downtown core June 26, 2010 after a small group of anarchists broke from the main anti G20 demonstration and began a destructive march through the downtown. Clashes erupted on the fringes of a large protest march outside the G20 summit in Toronto on Sunday, as hardline protesters set fire to a police car and scuffled with riot officers. AFP PHOTO / GEOFF ROBINS (Photo credit should read GEOFF ROBINS/AFP/Getty Images)