Are hemp, flax, chia, and sesame generally sold raw, or is heating processing used to isolate these seeds?
It seems like heat processing (Pasteurization) is normally used for all of these seeds, unless otherwise marked.
Hemp seeds (hemp hearts)
This 2015 article on NPR explains about a warehouse that performs heat treatment on flax and chia seeds.
See above about NPR article.
This random webpage claims that there is no such thing as a raw sesame seed.