It would be helpful to include the chemicals that are not currently among the class A precursors. There's a fine balance with the class A precursors, in that all of these chemicals are legitimate chemicals and are used throughout industry. So there's a fine balance between putting a burden on industry versus criminal intent in the use of these products.
Quite honestly, even if certain chemicals were legislated, there would still be other or alternative chemicals that organized crime could easily jump to. Some chemicals are very specific to manufacturing methamphetamine. There are a lot of chemicals involved in that process that can be switched off with other things.