(1) Nothing in this chapter permits anyone other than a validly licensed marijuana processor to use butane or other explosive gases to extract or separate resin from marijuana or to produce or process any form of marijuana concentrates or marijuana-infused products that include marijuana concentrates not purchased from a validly licensed marijuana retailer as an ingredient. The extraction or separation of resin from marijuana, the processing of marijuana concentrates, and the processing of marijuana-infused products that include marijuana concentrates not purchased from a validly licensed marijuana retailer as an ingredient by any person other than a validly licensed marijuana processor each constitute manufacture of marijuana in violation of RCW
69.50.401. Cooking oil, butter, and other nonexplosive home cooking substances may be used to make marijuana extracts for noncommercial personal use.