A garda sergeant who was convicted of assault has lost her appeal against conviction.
Martha McEnery was given a four-month suspended sentence last year after she was convicted of assault during the arrest of 38-year-old Anthony Holness in Waterford in January 2010.
Former garda John Burke, who was jailed for intention to pervert the course of justice, also lost his appeal.
Ms McEnery was convicted along with two other gardaí, Daniel Hickey and John Burke, who were jailed for 18 months and 12 months respectively.
Mr Burke was convicted of intending to pervert the course of justice by moving cameras in the garda control room while the incident was taking place.
Rejecting Sgt McEnery's appeal, Mr Justice Adrian Hardiman said the three-judge appeal court could not find her conviction was either unsafe or unsatisfactory.
He rejected the grounds of appeal put forward that the jury should have been directed on whether or not the arrest of Mr Holness was lawful.
Mr Justice Hardiman said the trial judge was correct to leave that for the jury to decide.
He said gardaí were given considerably more powers than members of the public, but the law applied to them exactly as it applied to all other citizens.
It had been submitted that if an arrest was lawful there could not be an assault.
Mr Justice Hardiman said it was not the case that a garda having made an arrest was entitled to use a particular degree of force without lawful excuse.
The trial judge had dealt with admirable fairness to both sides, he said, adding that the jury had dealt with the case with the maximum of discretion.
The Court of Criminal Appeal also rejected the appeal of John Burke.
Mr Justice Hardiman rejected submissions by the appellant that he was subjected to a "double jeopardy" in the trial.
The court also rejected submissions by Mr Burke that the jury had not been properly charged in relation to the reason he gave for the movement of the cameras.
Mr Justice Hardiman said the charge to the jury had been "impeccable" in this regard.
The judge said the case was a "very elaborate" one, which was fought on every conceivable basis and not in a consistent way between the defendants.
In August last year, the three gardaí were convicted for their role in assaulting Mr Holness. A fourth officer, Sgt Alan Kissane, was acquitted.
The incident happened at around 3am on 29 January 2010, when Mr Holness was on his way home from a night out.
He was seen urinating on New Street and resisted arrest.
The trial heard he was bundled to the ground and punched several times in the back of the head.
Sgt McEnery arrived on the scene with Sgt Kissane after responding to a radio call for help.
While Mr Holness lay face down on the ground, Sgt McEnery was alleged to have struck him on the head a number of times with a closed fist.
John Burke was operating the city's CCTV system in the communications room at Waterford garda station at the time, and was accused of twice directing a camera, focused on the scene, away from the incident for a number of seconds.
The trial judge, Leonie Reynolds, described the incident as "obscene acts of criminality" and commented on the "sheer ferocity" of the assault.