Ah, yes, isn't he the one who wrote a whole post explaining how one can reverse-engineer his own boarding pass to get PreCheck only to find out that there is a boarding pass signature. Trying to "expose" a "security flaw" that doesn't exist. Fail.
I question
Colpuck's motive(s).
Actually, I believe he said he wasn't sure if there was a boarding pass signature and whether or not his reverse-engineered boarding pass would, um, pass...