Explosions highlight dangers of making hash oil - Article Photos 1/4

FILE - In this Jan. 30, 2013 file photo, firefighters respond to the Heritage Hotel in San Diego, Calif., after a drug-related explosion. There are a growing number of casualties from manufacturing hash oil, a potent marijuana byproduct made with butane. Disasters from the do-it-yourself drug have been recorded around the country in a phenomenon reminiscent of meth lab mishaps, but not as common.(AP Photo/Lenny Ignelzi)