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Background and Objectives Mobile testing of executive deficits in substance‐related addictions is highly novel but requires validation. Methods Sixty‐one individuals (34 patients, 27 healthy controls) completed Ecological Momentary Assessments with mobile executive tests. Results Compliance with the tests was high (78% to 91%) in both the patient and control groups. No fatigue effects were detected, practice effects were observed for controls only, and convergent validity was found relative to neuropsychological assessments. Conclusions The use of mobile cognitive testing is feasible and valid in this population. Scientific Significance Mobile cognitive tests provide new opportunities for both research and clinical intervention. (Am J Addict 2018;27:553–556)

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