Someone is trying to extort money from a company that handles drug prescription benefits for 50 million Americans in what could be one of the more damaging cases of data loss on record. The incident may raise red flags for industry hopes of putting more health care information online in an effort to control costs. The FBI is looking into the extortion attempt against St. Louis-based Express Scripts, which Thursday notified federal authorities that it received a letter in early October that included personal information on 75 members and a demand for money.