Cops hate low level meth busts. There is no money in it. Usually addicts and street cooks don't own shit. There is nothing to seize, and the labs are so toxic the cost tens of thousands to clean up, leaving any property seized worthless. Even street dealers don't have a lot of cash; they deal to use. You have to catch the upper level dealers/distributors to find the cash.
All a meth street dealer or lab bust is to departments is expense. As the ferangi would say, where there is no profit, there is no effort. The only reason they make arrests is to try to get to the upper levels through snitches.
Cannabis, on the other hand tends to be very profitable. Usually the people smoking it own nice things. Dealers do as well, and they have cash, lots of cash.
Sure, the feds are focussed on the cartels, which push meth and opiates. But soon they get billions more to fight with, and cannabis will be a focus.
Your taxes will go up to pay for it. Your benefits/services will be slashed. Unless of course you are a part of the middle class in the 1% of top wage earners (the house published a chart claiming you are middle class if you make up to $450k, which is in the top 0.005 percentile of wage earners).
But leo's love cannabis busts. It's easy, safe, and profitable.