I don't want to target any particular LD "brief"-churning website or organization, but one of them was the reason I had to chastise an unsuspecting Novice LDer today.
He quoted a passage out-of-context from an article (that I'm more than familiar with), claiming that it showed how the International Criminal Court or something like it would be unconstitutional--even though the authors go to great lengths to show how it isn't.
In fact, part of the way through his "brief," I thought I detected the start of a paragraph saying exactly that; he blithely read the whole thing, though, not fully understanding what it meant.
So, novice LDers, beware of briefs. If you don't understand what you're reading, don't use it. Also, always track down the original article, and read the passage in context--or have someone help you if you're not sure. The people who cut-and-paste briefs aren't necessarily concerned with their accuracy; all they want is your money. Open LDers, watch out as well. You might be looking for a shortcut to success, but if your judge knows what's going on, you're doomed.
And remember, even I, your source for friendly, free, and sage LD advice, can be wrong. Verify my research, too. You'll be a better debater for it.
(Oh, and if you can guess where I'm blogging from, come on by and say howdy.)