The Editor in Chief of Fire Engineering Magazine, Bill Manning, cast dire warnings of malpractice and conflicts of interest in the official WTC investigations and destruction of evidence in the aftermath of the Twin Tower's collapse.  In hindsight, this man was well ahead of his time.  We quote him liberally in our 2-hour research edition of 9/11: Blueprint for Truth.

See Bill Manning's article "$elling Out The Investigation" on fireengineering.com