Daniel Gustafik chuckles when he remembers the simplicity of the first marijuana grow house he wired nearly 20 years ago. It was 1997, one year after California Proposition 215 legalized the cultivation and use of pot for medicinal use, and the wife of one of Gustafik’s friends was one of the state’s first residents to qualify for the legal exemption. “Hey, you know how to do these electrical things,” the friend said to him one day, as the pair discussed the small ...

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