cannabis genetics improved to the point where it was no longer unusual to find sinsemilla with concentrations of THC, marijuana’s principal psychoactive compound, as high as 15 percent. (Before the crackdown on marijuana growers, THC levels in ordinary marijuana ranged from 2 to 3 percent, according to the DEA; for sinsemilla, 5 to 8 percent.) Nowadays THC levels upward of 20 percent are not unheard of.
