There are two ways I've found on running checks. One is that the if a check is called for the character noticed SOMETHING even if it's just a bad feeling, but the failed check means that they can't find details or specifics. The other is that the player needs to pretend they don't know a check was made. In either case, you can't really re-roll unless you take actions that expressly arrange a new attempt which may trigger other problems.
In this case, I'm reading it as the first method, when you failed a roll you got that Star Wars "I've got a bad feeling about this." thing going on.
