The Post has an article on Lyster Dewey and his diaries, which record his work growing hemp, as well as other things, in the USDA gardens occupying the site where the Pentagon was built. USDA bureaucrats do many things.
Incidentally, during WWII the USDA also had a War Hemp program. Find other links by googling "War Hemp". I remember in the early 70's someone contacted the ASCS records people looking for the old records (I think the program was probably funded out of Commodity Credit Corporation funds.)