The Northwest has been hit particularly hard by the Meth epidemic. It is for the 21'st century what crack was in the 80's and 90's. Oregon has passed a law just like the one you described. It seems to be helping the situation bu cutting out the main, active ingredient. But Methheads are quite resourceful and have found ways of getting around it by banding together. Another huge problem in the Metro-Portland area is metal. Meth heads have resorted to stealing metal and copper wherever they can find it. I can't remember the pound to dollar ratio, but its pretty high, making it one of the more lucrative metals to sell. Its so bad that they are tearing up guard rails, pulling apart bridges and train tracks. And for the copper, they go into new construction areas where an electrician has already layed cable through the house and steal it for the copper filament.
Any evidence?