A very slippery slope here.

-- The popularity of hash oil is on the rise. Butane, a flammable solvent, is often used to make the potent marijuana concentrate. The report cites a recent investigation by The Oregonian into butane hash oil, which identified nine major BHO-related explosions since 2011, including one that killed a Portland man.

“Liquid THC production - - and incidence of butane hash oil lab explosions -- is expected to rise as the market expands for marijuana edibles and demand increases for product that has a strong psychoactive effect,” the report notes.

http://www.oregonlive.com/marijuana/index.ssf/2014/06/medical_marijuana_in_oregon_st.html