They do with an emulsifier.

Anyways, I always wondered how weed tea worked too and thought it was bs up until a couple days ago. The way I see it is, if you activated the THCA and bake it into THC than it works. So you need to eat the heated plant matter or something that has binded with the THC (ie fats and alcohols). I've baked straight weed in a foil pouch before and gotten stoned out of my mind after eating it. Here is an exerpt from an interview with Dr Hornby, the main researcher behind a lot of Advanced Nutrients testing and development:

"CC: Could you clear this up a little bit? What is Delta 9, how many compounds are you talking about?

DH: Delta 9-tetrahydrocannabinol is a psychoactive cannabinoid. It’s what gets you high. In B.C. bud, there are only five compounds in any great quantity. There’s tetrahydrocannabitriol acid – THCA abbreviated. Then there’s Delta 9-tetrahydrocannabinol (THC), there’s cannabinol (CBN), then cannabidiolic acid, and then there’s cannabidiol (CBD). Those are the five compounds you see in any sort of quantity in B.C. bud. This is the way they have been bred and environmentally manipulated by the breeders to produce these five compounds over the years, to push up the THC level. Now, when I look at a B.C. sample, the compound that you see in the most abundance is THCA, because when you heat THCA it converts directly one-to-one to Delta 9-tetrahydrocannabinol, the compound that gets you high. The way I analyse cannabis is by high pressure liquid chromatography, or HPLC. Ninety-nine percent of the analyses done on cannabinoids use gas chromatins. But liquid chromatography works at near room temperature; with gas chromatography, you have to heat the sample to vaporize it, to put it in the gaseous state. When you heat cannabis, you change its whole structure, you change its properties. You can heat the sample and stop it anywhere you want to get the Delta 9 concentration that you want, so gas chromotography can be manipulated to give a wide range of results. Because I’m not heating it, I see the way it is in nature, with the THCA unconverted to the Delta 9. When you see the way it is naturally, you get an idea of how to make the medicine. If you burn or heat the sample – if you do a gas chromatography – you miss all that, because the THCA is not psychoactive, and you’re converting it one to one to a compound that is (Delta 9). You shouldn’t do that to analyze it in its original state."

Dr. Hornby Of Advanced Nutrients

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What I just posted is total fiction^