I don't really use it, the point is this stuff is still used on 1/3 of US crops while it is Illegal in most industrialized and some undeveloped countries. It caused the largest industrial accident in history, and is proven to cause cancer. And it is being mixed into the nation's food growing medium. It's in your kids school lunch for God's sake. The amount of outrage you felt toward a caregiver giving this to his patients, should equally be felt tward the farmers and large ag companies that use these type of products.
And this is the stuff you have to look out for when you buy cannabis in a store in a legal state.
It is better to go through a small grower you trust. Similar to a microbrewery small growers are capable of producing more unique and sometimes better products, and more importantly you know what was used to grow it, and how it was prepared.