If your players are puzzled by something, and then one says, "Aha! It must be [whatever]!" - even if it wasn't remotely what you were thinking - let them have it occasionally. They'll think they are so clever at having worked out your puzzle, and you won't have the stress of them failing to read the most obvious clues like they usually do.
[Reminder: Our guest commentators have not seen Rogue One. Part of the fun is seeing how their untainted impressions re-interpret the movie through the lens of our comic.]
Even today's technology has functionality that (supposedly) can detect if the hand/finger being scanned is attached to an alive person. Imperial engineering at its finest as usual.
And in the GM's defense, the chance of a laser sword (a highly specialised Jedi weapon) being left lying around some random Imperial base is basically nothing.
But then, who hasn't found a bronze dagger in some formerly-animated slime. Anything could happen really.
Ah, yes. The biometric scanner. Prevent a stolen password, ensure a stolen hand. Clearly, working at a place with biometric scanners must come with hazardous pay.
And personally, rolling only one die and not looking at the result? Pick up a whole handful of dice and then drop them without looking at the result.
"Portentously"? I look at that word, I see the first four letters, and I think of an absolutely giant door in a videogame that swings open to reveal a normal sized door hidden behind (Portal :-)
Cassian: Okay, think, how do we get into the vault? A password?
K-2SO: I don't think this guy would have been able to remember a password.
Cassian: Aha! It must be biometric. Look around for a scanner.
GM: <roll> You spot a palm print reader.
Bria: Bingo! We drag him over and put his hand on the scanner.
GM: The vault door opens.
Bria: Awesome! We should take him with us in case there's more security.
Cassian: He's too heavy.
K-2SO: His hand isn't too heavy.
Cassian: We're the good guys. We don't go around chopping people's hands off.
Bria: I look for a laser sword.
GM: There are <roll>... zero laser swords in the vicinity.
Bria: You didn't even look at the result!