DURHAM - A Durham police detective investigating the Duke University lacrosse case arrested an alibi witness Wednesday on a 2 1/2-year-old misdemeanor warrant. Taxi driver Moezeldin Elmostafa said Investigator R.D. Clayton and another officer asked whether he had anything new to tell them about the rape case before driving him to the Durham County jail. He said no and was held for five hours, until a friend posted his bail on a shoplifting charge. Ernest Conner, a Greenville lawyer who represents defendant Reade Seligmann, said the cabbie's arrest amounted to intimidation. "It appears to me they are trying to pressure...