If you want basic dates and basic info go to the DoC site--poison ops; and the OSPRI site.
If you want greater detail go to your local regional council, and also to the District Health Board , Medical Officer of Health or the Health Protection Officer. For detailed regulations on the use of poisons go to the EPA website and look through the HSNO regulations.
A tangled web so sort through with sackfuls of red herrings, smoke and mirrors along the way.
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