Expert testimony concerning the reliability of eyewitness identification was properly excluded from the trial of a man accused of gunning down two people, a federal judge held.In a written opinion last week, U.S. District Judge Thomas M. Durkin rejected the argument that Robert Anderson’s right to due process was violated when his expert witness was barred from taking the stand.Durkin denied Anderson’s petition for a writ of habeas corpus.Anderson was convicted of first-degree murder in the March 2003 slayings …