First Clue: Use Available Knowledge - the presumption is Innocent Until PROVEN Guilty, not the other way around.

Second Clue: Use Common Sense - legal growers are permitted to grow a specific, fairly small, number of plants at their personal residences. If someone has a few plants growing in their private yard, common sense would indicate that this is not worth wasting departmental resources on (even if, maybe, they don't have a medical card. Little-guy personal growers are NOT a big enough problem to waste this kind of law enforcement deployment on.) Go look for a meth lab and give us taxpayers a return on our investment!

Third Clue: Employ economic efficency (see Second Clue) allocate resources in such a way that your dollar-value is MAXIMIZED, not minimized and marginalized.

The problem is not with the cannabis growers, or users.  It is with the failed and costly prohibition of a plant that has been proven to be less harmful, (and often healthy for you, hence the medical Cannabis laws) than drugs that are legally used by most of the police and law-makers on a daily basis.  Nicotine, Alcohol and Caffeine are all addictive and psychoactive substances that are not only much more harmful than anything that can be proven by prohibitionists about Cannabis, but kill people!  Yet they are legal, and widely used and sold.  Pure hypocrisy.  

Not only is this prohibition ("Drug War") fruitless and incredibly costly, but it is quite clear, from a purely empirical viewpoint, not working!!!  Not only that, but public opinion and pressure is clearly leading to decriminalization of Cannabis.  Law enforcement is hanging on to an old paradigm that no longer works, and are actually setting up situations where violence is likely to occur, then complaining that the system is "making" them be violent (in line with their own assumptions outlined in the article)

The real motivation behind these complaints by the police is easily discerned by the statements of the persons involved.  For example... "If we get a tip that there's a marijuana grow, I don't think agents are going to feel comfortable calling someone who's not even law enforcement and asking if they're legit," said White, a former Bernalillo County sheriff and former state Department of Public Safety secretary.

That's just a control issue!

This isn't about marijuana any more.  It is about a failed policy that police are having a hard time accepting that they need to give up.  ...Costing many millions of dollars and ruined lives in the  process.