I have been dehydrating and grinding jalapeño and habanero peppers for years (and learned a couple of lessons the hard way!). We've just raised a crop of ghost peppers, and I just put them in our HarvestRight freeze-dryer, and plan to mill the finished product into a powder. I'm a bit apprehensive about processing them, but will use safety goggles, breathing mask and gloves!
I've searched the Web and not found anything on freeze-drying and grinding/milling hot peppers. Another old thread on these forums ased about HarvestRight freeze-drying peppers, but petered out. Anything new out there?