PHILADELPHIA (AP) — After waiting more than four decades to clear his name in a friend’s 1980 killing, Subramanyam Vedam was set to walk free from a Pennsylvania prison this month.

Vedam and Thomas Kinser were the 19-year-old children of Penn State University faculty. Vedam was the last person seen with Kinser and was twice convicted of killing him, despite a lack of witnesses or motive.

More than 420 anti-science bills attacking longstanding public health protections – vaccines, milk safety and fluoride – have been introduced in statehouses across the U.S. this year, part of an organized, politically savvy campaign to enshrine a conspiracy theory-driven agenda into law.