Peyton Manning's lawyers hired two private investigators to visit the parents of the primary source in a documentary linking him to human growth hormone, before the report was released, according to The Washington Post on Thursday.
The investigators visited the Brownsburg, Ind., home of Randall and Judith Sly on Dec. 22, according to The Post. They are the parents of Charles Sly, the primary source in al-Jazeera's documentary that claimed an Indianapolis anti-aging clinic shipped HGH to Manning's home.
Sly, a former pharmacy intern, was filmed undercover by al-Jazeera saying The Guyer Institute, where the Broncos quarterback was a patient in 2011, shipped HGH to his wife, Ashley Manning.