The evidence of a gang expert got a verbal bashing for the second time this week in the Court of Appeal yesterday.It was defence lawyer Elizabeth Christopher’s turn to tell the three-judge panel that Sergeant Alexander Rollin should not have been allowed to give his opinion on a defendant’s gang links.She was representing Antonio Myers, who was convicted last year of slaying rival gangster Kumi Harford in a hail of bullets.The trial heard from Sgt Rollin, of the gang targeting unit, that Myers was a member of the Middletown gang while Mr Harford was a member of 42. He went on to detail the murderous rivalry between those two factions.Earlier this week, defence lawyer Larry Mussenden argued that Sgt Rollin did not meet the legal test necessary to be declared an expert and share his opinion of people’s gang links with juries.He was addressing the appeal of David Cox — who was found guilty in another gang case after evidence from the same police officer.Mr Mussenden noted that Sgt Rollin has testified in a number of high profile appeals in recent years, and urged the Court of Appeal on behalf of all defence lawyers to make a ruling on the issue.“We are really begging for the ruling in respect of the gang expert and the gang evidence,” said Mr Mussenden.Yesterday, Ms Christopher said in the relation to the Myers case: “What was put forward by the witness Mr Rollin was opinion evidence and as such, ought not to have been admitted in the absence of proven facts upon which he’s basing his opinion.”A team from the Department of Public Prosecutions, led by Director Rory Field, is contesting the appeal, which continues.