A historian specializing in drugs and addiction took the stand Wednesday as the first witness in the state of New York’s multidefendant opioid lawsuit, delivering broad testimony indicative of the wide scope of the lawsuit.

Attorneys for the state government, along with Nassau and Suffolk counties, are seeking to prove that the defendants, who manufactured and distributed opioids in the state during the past two decades, caused a public nuisance by knowingly marketing highly addictive drugs.