BOSTON — Plexiglas, social distancing and masks are the new reality as court systems work to balance public health during a pandemic and the right of the accused to have a timely and fair trial. With former mayor Jasiel Correia II’s trial set to begin on Tuesday, U.S. District Court Judge Douglas P. Woodlock in a final pretrial conference on Monday gave an overview of new court protocols. Only 26 people will be allowed in Courtroom 1 the John Joseph Moakley United States Courthouse for the duration of the trial. Woodlock said he anticipated the trial could last more than three weeks.