Around this time last year, an article was published in the Journal of Addiction Medicine regarding a study designed "to measure the prevalence of substance use and mental health concerns among licensed attorneys, their awareness and utilization of treatment services, and what, if any, barriers exist between them and the services they may need."
See http://journals.lww.com/journaladdictionmedicine/Fulltext/2016/02000/The_Prevalence_of_Substance_Use_and_Other_Mental.8.aspx