New England Compounding’s owners and employees still face potential criminal charges in the case.
Carmen Ortiz, the US attorney for Massachusetts, said last month that a yearlong federal investigation in the case was “moving forward” but could not say when indictments might be issued.
Michigan, where many of the victims lived, has said it might pursue criminal charges if it finds state laws were broken.
The episode inspired federal legislation, which President Obama signed into law last month, aimed at increasing federal oversight of compounding pharmacies to avoid similar cases.
Critics say compounding pharmacies, which custom-make medications for individuals who need speciality drugs not available elsewhere, have not traditionally received enough scrutiny because they are mainly overseen by states, rather than the US Food and Drug Administration, even when companies ship large volumes of drugs across state lines like bigger manufacturers. But some watchdogs and industry observers disagree about whether the law will have much impact.