This study conducted by ALM Resources Ltd. for the Pesticide Management Branch, British Columbia Ministry of Environment, Lands and Parks, looks at the impact of extending the requirement for certification from users of Restricted pesticides to users of all Commercial pesticides.
Johnson, Mary Alice. 1993. Impact Assessment for Extending Pesticide Applicator Certification Requirements to Use of All Commercially Labelled Pesticides: Agriculture Sector. Ministry of Environment, Lands and Parks