David Berkowitz, assistant director of the pharmacy at Newton-Wellesley Hospital, said he questions the validity of many drug expiration dates. (Erik Jacobs for ProPublica) The news sent Berkowitz running to his expired drugs to. The box of prescription drugs had been forgotten in a back closet of a retail pharmacy for so long that some of the pills predated the 1969 moon landing. Most were 30 to 40 years past…