17. Subject has a positive test result for drugs of abuse (amphetamines, barbiturates, benzodiazepines, cannabinoids [including medical use of marijuana], cocaine, methamphetamine, methadone, or methylenedioxy-methamphetamine) at Screening. Subjects with a positive test result for prescribed drugs may be included in the study at the discretion of the investigator. Subjects with a positive test result for cannabinoids with a prescription for medical marijuana will be excluded from the study, subjects with a prescription for dronabinol (∆-9-tetrahydrocannabinol) may be included at the discretion of the investigator.