However, The Lewin Group has acknowledged that clients sometimes choose not to publicize the results of studies they have commissioned. Indeed, Lewin Group Vice President John Sheils told "The Washington Post" that "sometimes studies come out that don't show exactly what the client wants to see. And in those instances, they have option to bury the study." Drug and alcohol treatment are generally covered under UnitedHealth Group and UnitedHealthcare plans, but the exact benefits and coverage offered depend on your policy.