Patients with a history of cocaine abuse in the past year who are scheduled to undergo surgery at Parkland Hospital will be asked to provide a urine sample for a screening toxicology test on the day of surgery. Patients will also be asked to fill out a questionnaire with questions pertaining to their drug use history. The remaining aspects of perioperative care, including the general anesthetic technique, will be standardized for all patients and will not differ from the standard of care. The anesthesia faculty, resident, or CRNA will identify patients and obtain consent and ask the patient to fill out the questionnaire. This prospective study is intended to enroll 300 cocaine positive and negative patients over a 2 year period.