ethnoman
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I have studied enthobotany for much of my life. Preserving nonvolatile compounds during the drying process has been studied in dozens of medicinal herbs. I can’t comment on freeze drying as it’s totally impractical for me, so’ve never given it much thought. But I dry cannabis the same way I dry Salvia divinorum at around 110F, low humidity and make sure the whole process is done as quickly and efficiently as possible. Here’s a really good paper. I know it’s quite long but it’s an easy read you don’t need to have a background in organic chem. Cannabis is not discussed in this paper (seems the authors wanted to preserve their academic careers) but the general consensus over most plant varieties is the same; quickly drying with low heat. http://www.academicjournals.org/article/article1380785461_Rocha et al.pdf