You are surprised the FDA responded honestly to a Freedom of Information Act request?

The FOIA request was a request to the FDA from Bloomberg for the FDA's investigation on Castle. It was used by Bloomberg to write the article. The Freedom of Information Act is only to request information from a government agency. To uncover the fraud the FDA physically visited Castle. They were tipped off by a disgruntled former employee. Without the tip off there is a extremely small chance they would have ever been caught.