[quote=LeeRoy]
Argument? This is a theoretical situation, albeit a very specific one.It could also be a droid, correct me if I'm mistaken, but droids can't be detected right?
[/quote]

They have some inherent resistances to the force, but obviously they can still be detected, as the specific scene in the films where Luke is mastering his powers shows him blocking lazers from a droid training ball thing.