Illegal logging and trade are one of the most important issues in world politics, strongly connected with deforestation and forest degradation, especially in developing countries with tropical forests. As a result, many different international policies designed to tackle these issues have been developed over the years, led both by state and non-state actors. Although the role of state actors in certification mechanisms has been previously analyzed, the response of non-state forest certification actors to potentially competitive systems of legality has not yet been analyzed. The case of Argentina presented in this paper shows how a coalition between international actors such as the Inter-American Development Bank (IDB) and land owners, with great power in the country, gathered through forestry associations have managed to create a timber legality verification mechanism, even with financing from the national state. In this case, the state gives up its regulatory power and the possibility of increasing its institutional capacities vis-a-vis private actors. Addressing the response of private certification actors to legality mechanisms will allow for important and in-depths insights into the relationship between state and non-state actors and potential future joint mechanisms designed to address illegal logging and deforestation.