The 'dangers' of grow-ops is generally a disingenuous myth perpetuated by law enforcement in a last gasp attempt to uphold cannabis prohibition or curtail home hobbiests.  

In fact, the Federal Court's Allard judgment on 24 Feb 2016 found that "The evidence establishes that the great majority of patients were able to produce their own cannabis as medicine without any threat to their own health and safety or that of the public."  

Legal home-production means you can grow a few plants at home for personal consumption or sharing, not a housefull of marijuana or a commercial operation.  It means that local ordinances for nuisance issues need to be respected.  And, that electrical, plumbing and building codes need to be respected.  

These are issues for municipal by-law officers, not our police.