Among the issues pending before trial are requests to the judge by prosecutors to allow testimony from a Hernandez friend who says Hernandez owned a gun similar to the one used to kill Lloyd, and to prevent the defense team from calling an expert witness who can describe the effects of the drug PCP on the brain. The trial is expected to last six to 10 weeks, and dozens of witnesses could be called, including Patriots coach Bill Belichick and team owner Robert Kraft.