didnt know this but according to wikipedia
It has been alleged that G-13 was created by the /FBI"]who focused on hybridizing different strains of cannabis in the 1970s. Supposedly, these organizations bred a strain of cannabis through hybridization that was more potent than any other. It also supposedly has a concentration of THC"]THC of 28% (approx) by weight, which is almost double the average amount of the chemical in most high-grade grown commercially. One story states that a single cutting of this potent strain was liberated from the government facility in Mississippi /G-13#cite_note-1"]Although the University of Mississippi assembled a world class cannabis collection during the late 1960s and early 1970s, there is no evidence that these researchers were ever involved in breeding high quality cannabis.
It has been alleged that G-13 was created by the /FBI"]who focused on hybridizing different strains of cannabis in the 1970s. Supposedly, these organizations bred a strain of cannabis through hybridization that was more potent than any other. It also supposedly has a concentration of THC"]THC of 28% (approx) by weight, which is almost double the average amount of the chemical in most high-grade grown commercially. One story states that a single cutting of this potent strain was liberated from the government facility in Mississippi /G-13#cite_note-1"]Although the University of Mississippi assembled a world class cannabis collection during the late 1960s and early 1970s, there is no evidence that these researchers were ever involved in breeding high quality cannabis.