Alcohol test results are immediate as results printed out from EBT device or saliva swabs. All DOT drug tests have to be sent for laboratory and MRO (Medical Review Oﬃcer) evaluation. Negative tests are resulted, updated in system and communicated usually within 2-3 business days by email. If a sample is “presumptive positive”, this means that for example someone has levels of codeine in their system from recently taking a prescription after getting their wisdom teeth out. The MRO will then contact the donor in order to speak directly with their doctor to conﬁrm prescription was provided by doctor and detection levels are within range of prescription.