WASHINGTON — The university that employed a controversial herpes vaccine researcher has told the federal government it learned last summer of the possibility of his illegal experimentation on human subjects. But Southern Illinois University did not publicly disclose the tip or its findings about researcher William Halford’s misconduct for months, according to a memo obtained…

As 20 Americans and Brits flew to a Caribbean island for a controversial herpes vaccine trial, many of them knew there were risks. The lead U.S. researcher, William Halford, openly acknowledged he was flouting Food and Drug Administration regulations in the consent forms they signed. He would be injecting them with a live, though weakened,…