Go read it yourself. It's very long so I didn't read all of it.
The patent was granted in 2006, they've been using it for DECADES.
It's legal because "humans" are classified as "animals".
They can use ANY method of distribution, food, water, airborne, medications, and everything in between.
This also proves that they are, and have been, modifying our DNA. I always wondered how people could possibly be ignorant enough to ignore the MASSIVE amount of proof behind "conspiracies". This is why.
If you go read it, you'll notice 100's of references to other patents and publications. If anybody has the time, go look into them. Some of them sounded pretty bad as well.