This paper aims to discuss the effect mode II type tests have on the cohesive law of bonded joints. For this reason, an objective inverse method has been developed to extract the cohesive law for experimental load-displacement data using an analytical procedure to represent the fracture process zone of mode II tests. The method is implemented on the more popular and standardized mode II tests: End-Notched Flexure and End-Load Split. The analysis of the experimental data shows that the cohesive law is independent of the test type. In addition, the obtained fracture toughness calculated by integrating the cohesive law shows good agreement with the J-integral method.