The First Advantage MRO team review chain of custody and test results and conducts the entire donor interview process as prescribed by federal regulations. Specifically, in the case of confirmed non-negative results, MROs conduct phone interviews with the donor and, if needed, the donor’s doctor and/or pharmacist. The goal is to determine if there is a legitimate medical explanation for the test result, such as a current, legal prescription for a drug being used to treat a medical condition. A Medical Review Officer (MRO) is a person who is a licensed physician and is responsible for receiving and reviewing laboratory results generated by an employer’s drug testing program and evaluating medical explanations for certain drug test results.