The Associated Press 2/26/03 7:10 PM GRETNA (AP) -- A uniformed security guard at Armstrong International Airport was arrested on one count of extortion Wednesday after allegedly trying to shake down a man who had a gun in his car. Telita Arnolie, an employee with L&R Security, found a firearm in a man's car while performing a routine vehicle inspection at the airport, Jefferson Parish Sheriff's deputies said. Although officials said that having the gun in the car was not a violation, Arnolie allegedly told the man she'd arrest him if he didn't pay her $40. Chief Deputy Newell Normand...