If you are buying from a FFL, yes, just like in a store.
There is no "loophole", the law still applies, even on 38th Street. Now if IMPD could actually have people follow the law on 38th Street.
Maybe it's a myth I heard about gun shows then.
Or maybe it was about something else, like there is no waiting period in gun shows as opposed to FFL dealers in stores.
That must be in states where they have a waiting period.
I must have heard on TV, something like "In gun shows drug dealers can buy machine guns without a background check and get free ammo on top of that".