Spies do judge books by their covers. Michael tells the viewers this as he explains why it's difficult to forge a document. The clip is courtesy of the episode "Blind Spot."
Sam: I think it's time for some Chuck Finley action Fiona: His name is Charles, you need a new cover id. Sam: Sorry Fi, I don't think so, Chuck Finley is forever.
Fiona: So you and Jesse are poking Barrett with a stick. Why does the term "sitting ducks" come to mind? Michael: Jesse and I are pretty well armed ducks.