CBD is most definitely psychoactive. It also accounts for about 25-50% of marijuana's active components, so we are living in a world full of long-term data.
Cannabidiol is most definitely illegal in the US, too. That DixieX site you link to is just hemp oil products -- no psychoactives.
CBD is considered non-psychoactive by fiat. This is because it has a low affinity for receptor sites in the brain and it doesn't cause significant impairment. You may or may not be able to feel it though. And it's definitely not 25-50% of most commercial strains (unless specifically bred for it), that may be true of certain landrace varietals though.
Also the amount of cannabinoids DixieX is citing is actually the minimum CBD content. They show their lab results on their Facebook page. The reason the don't cite the CBD content is because CBD is illegal, but hemp products are legal if the THC content is below a certain level. They're trying to play it off as a legal grey area and are taking a calculated risk.
And I don't mean 25-50% of the plant mass, I mean CBD will often make up 25-50% of an extract. (Wikipedia has my back with a 40% figure: http://en.wikipedia.org/wiki/Cannabidiol)
Fiat non-psychoactive, not fiat legal. It's definitely still illegal. But it's included on all the lists of non-psychoactive cannabinoids.
As for that journal article, it's behind a paywall even though it's from 1940 so I can't comment on it. But if you look at the menus for any dispensary that tests for both THC and CBD, you'll see that CBD is rarely a significant percentage of the cannabinoids, e.g.
Cannabidiol is most definitely illegal in the US, too. That DixieX site you link to is just hemp oil products -- no psychoactives.