Examining Opioid Treatment Infrastructure Act of 2018 This bill requires the Government Accountability Office to report on inpatient and outpatient treatment capacity, availability, and needs, including detoxification programs, clinical stabilization programs, transitional residential support services, rehabilitation programs, treatment programs for pregnant women or adolescents, and treatment through Indian health programs. The report must include the barriers to real-time reporting of drug overdoses at the federal, state, and local level and ways to overcome those barriers.