Since the legalization of marijuana has taken effect in Colorado this year, there have been at least 31 incidents of hash-oil explosions, up from 11 in the entirety of 2013. Explosion can happen when leaves and stems from pot plants are put into a pipe filled with butane, which is then heated. The oil can be as much as 80 percent THC, the chemical that gets you high. “These today are the meth labs of the ’90s. We have to change our thinking and what we’re looking for,” said a police sergeant of a Denver suburb that experienced an explosion. According to The Cannabist, fans of hash oil say one or two drops can produce a better high than a whole joint.