Home Law GAO Unconvinced by Challenge to Sole-Source BPA; Castro & Company, LLC, GAO... LawNewsProtestsResource Library GAO Unconvinced by Challenge to Sole-Source BPA; Castro & Company, LLC, GAO B-419366 February 25, 2021 68 Share FacebookLinkedinTwitter liveostockimages | Shutterstock You must be a Paid or Free Trial Member to Access this Content. Paid members, please login to view your news subscription(s). RELATED ARTICLESMORE FROM AUTHOR Law Unimpressed with Agency’s Glib Price Realism Analysis, GAO Recommends a Do-Over Law Does the “Late Is Late” Rule Also Apply to Agency Protests? Law Protester Argued Solicitation Amendment Necessitated Full Proposal Revisions. GAO Didn’t Agree.