Background checks?

Somebody tell me who obtains a gun legally and does not undergo a background check?

After the tragic murders in Virginia this morning, on Huffington Post Terry McAuliffe notes:

""Everyone who purchases a gun in the Commonwealth of Virginia should have to go through a background check," McAuliffe said. "You go into the store, you hand your license over. It doesn't take ... but three, four, maybe five minutes maximum."

Who obtains a firearm legally without doing this?  Someone tell me.  I have purchased several firearms - in stores, at gun shows, and even online - and I have never failed to have a background check where the call is made and an "All clear" is given.

It never fails that decisions are made without data, that opinions are expressed without the facts.

So what is it the governor is seeking? Do we know yet how the alleged shooter obtained his firearm?  Do we know if he was subjected to a background check?  Or are we, as usual, jumping to conclusions, offering suggestions that are already in place and would not have made a difference? Why?  Because they want a law, any law, as a starting point.