The DEA warns marijuana grow spots are the 'new meth houses'

A June report by the DEA's Denver division warns of potential dangers and annoyances posed by large-scale marijuana growing operations hidden in residential neighborhoods. These operations can be a nuisance to neighbors, prompting complaints about "strong odors, excessive noise from industrial air-conditioning units, blown electrical transformers, and heavy vehicle traffic," according to the DEA.

Beyond that, a big indoor marijuana operation requires lots of high-powered lighting, water, and ventilation. People making these modifications in a haphazard or amateurish way risk doing serious damage to their homes.