BHO Extraction is illegal in California Common Extraction Technologies
According to Herb, 2 types of extraction methods are the most common and popular today: BHO (Butane Hash Oil; also known as dab, wax, shatter, honey, crumble) and Supercritical CO2 (Carbon Dioxide at high PSI).
BHO tends to feature stronger terpene expression than CO2 (terpenes are important flavor and aroma molecules found in plant resins. There are over 140 different terpenes in a plant; the more terpenes present in concentrate the better as terpenes enhance the medicinal effects of cannabinoids). However, BHO is more likely to contain residual solvents, which can be toxic (even 1% would be dangerous especially if swallowed or used to make edibles). The BHO technology is highly explosive and not environmentally friendly (petroleum product). Due to the dangers, BHO extraction is illegal in California (see also “California Bill Could Disrupt Cannabis Concentrate Production by Limiting Butane Extraction“). Other US states could follow California‘s lead, especially if alternative, safer methods of extraction become commercially available.
Read more here:
How Disruptive Technology Can Take The Cannabis Industry To A Higher Level
https://rockstone-research.com/index.php/en/research-reports/3800-How-Disruptive-Technology-Can-Take-The-Cannabis-Industry-To-A-Higher-Level