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['Drug and Alcohol Testing - DOT']
['Drug testing - Motor Carrier', 'Designated employer representative (DER) - Motor Carrier', 'Drug and alcohol policy - Motor Carrier', 'Drug and Alcohol Clearinghouse - Motor Carrier', 'Medical review officer (MRO) - Motor Carrier', 'Alcohol testing - Motor Carrier', 'Substance abuse professional (SAP) - Motor Carrier', 'Follow-up alcohol and drug testing - Motor Carrier', 'Return-to-duty drug and alcohol testing - Motor Carrier']
08/18/2025
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InstituteDrug and alcohol policy - Motor CarrierMedical review officer (MRO) - Motor CarrierDrug testing - Motor CarrierDrug and Alcohol Testing - DOTTransportationReturn-to-duty drug and alcohol testing - Motor CarrierEnglishDrug and Alcohol Clearinghouse - Motor CarrierFleet SafetyFocus AreaDesignated employer representative (DER) - Motor CarrierSubstance abuse professional (SAP) - Motor CarrierAlcohol testing - Motor CarrierAnalysisIn Depth Sub Topics (Level 4)Follow-up alcohol and drug testing - Motor CarrierUSA
How the return-to-duty process and Clearinghouse work together
['Drug and Alcohol Testing - DOT']

- The Clearinghouse and return-to-duty processes go hand-in-hand.
The return-to-duty and Clearinghouse processes are two separate processes. However, there are several places where the two overlap.
Here is how the combined process would work, starting at the point the prohibited action (failing a drug or alcohol test, refusing a test, etc.) is discovered by the carrier and the driver is removed from all safety-sensitive functions:
- The carrier must provide the driver with an acceptable substance abuse professional (SAP) referral. Under DOT regulations, the carrier has no more responsibility at this point. As far as the DOT is concerned, the carrier can terminate or suspend the driver, or retain the driver in a non-driving status.
- The correct entity must make the Clearinghouse entry related to the prohibited activity.
- In the case of a positive drug test or a refusal situation involving the medical review officer (MRO), the MRO must make the entry.
- If the situation involves a positive alcohol test, an actual knowledge situation, a refusal involving the carrier, or alcohol use following a crash that required testing, the carrier must make the entry.
- Once the Clearinghouse entry has been made, the driver is listed as “prohibited” in the Clearinghouse.
- The Clearinghouse communicates the “prohibited” status to the driver’s state of licensing, resulting in a downgraded CDL.
- The first step in returning to driving is the driver completing an evaluation and treatment with an SAP. The driver must designate the SAP in the Clearinghouse allowing the SAP to enter completed steps. Once the evaluation and treatment process are completed, the SAP will enter this into the Clearinghouse.
- The driver must then pass a return-to-duty test. The carrier overseeing/accepting the return-to-duty test must enter the negative results into the Clearinghouse.
- Once the driver has completed the SAP process and passed the return-to-duty test, and both of these are entered into the Clearinghouse, the “prohibited” entry will be removed from the driver.
- Before operating a CMV again, the driver’s downgraded CDL must be reinstated. Check with the state of licensing on the procedures to reclaim the CDL once the driver is in a “not prohibited” status in the Clearinghouse.
- The driver must then complete all of the required follow-up tests. If the driver switches carriers before the follow-up tests are all complete, the new carrier must pick up where the previous carrier left off and complete the follow-up testing.
- Once the driver completes all follow-up tests required by the SAP, the carrier employing the driver at that time needs to enter that all follow-up tests are completed.
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drug-and-alcohol-testing-dot
FOUNDATIONAL LEARNING
InstituteDrug and alcohol policy - Motor CarrierAlcohol testing - Motor CarrierFleet SafetyDrug and Alcohol Testing - DOTDrug testing - Motor CarrierTransportationSafety-sensitive function - Motor CarrierEnglishAnalysisFocus AreaCompliance and Exceptions (Level 2)USA
What regulations apply to DOT drug and alcohol testing?
InstituteDrug and alcohol policy - Motor CarrierMedical review officer (MRO) - Motor CarrierDrug testing - Motor CarrierDrug and Alcohol Testing - DOTTransportationIn Depth (Level 3)EnglishFleet SafetyBreath alcohol technician - Motor CarrierConsortium: third-party administrator (TPA) - Motor CarrierDesignated employer representative (DER) - Motor CarrierSubstance abuse professional (SAP) - Motor CarrierAlcohol testing - Motor CarrierAnalysisFocus AreaUSA
Key definitions
InstituteDrug and alcohol policy - Motor CarrierAlcohol testing - Motor CarrierFleet SafetyDrug and Alcohol Testing - DOTDrug testing - Motor CarrierTransportationIn Depth (Level 3)Consortium: third-party administrator (TPA) - Motor CarrierDesignated employer representative (DER) - Motor CarrierSafety-sensitive function - Motor CarrierEnglishAnalysisFocus AreaUSA
What is the designated employer representative’s (DER’s) role?
InstituteDrug and alcohol policy - Motor CarrierAlcohol testing - Motor CarrierMedical review officer (MRO) - Motor CarrierFleet SafetyDrug and Alcohol Testing - DOTDrug testing - Motor CarrierTransportationFocus AreaDesignated employer representative (DER) - Motor CarrierConsortium: third-party administrator (TPA) - Motor CarrierEnglishAnalysisIn Depth Sub Topics (Level 4)USA
DER as contact person
InstituteDrug and alcohol policy - Motor CarrierAlcohol testing - Motor CarrierMedical review officer (MRO) - Motor CarrierFleet SafetyDrug and Alcohol Testing - DOTDrug testing - Motor CarrierTransportationIn Depth (Level 3)Consortium: third-party administrator (TPA) - Motor CarrierEnglishAnalysisFocus AreaUSA
What service providers will a motor carrier need to manage its testing program?
InstituteDrug and alcohol policy - Motor CarrierMedical review officer (MRO) - Motor CarrierIn Depth Sub Topics (Level 4)Drug testing - Motor CarrierDrug and Alcohol Testing - DOTEnglishFleet SafetyBreath alcohol technician - Motor CarrierFocus AreaConsortium: third-party administrator (TPA) - Motor CarrierSubstance abuse professional (SAP) - Motor CarrierAlcohol testing - Motor CarrierAnalysisTransportationUSA
Auditing service providers
InstituteDrug and alcohol policy - Motor CarrierAlcohol testing - Motor CarrierFleet SafetyDrug and Alcohol Testing - DOTDrug testing - Motor CarrierTransportationFocus AreaConsortium: third-party administrator (TPA) - Motor CarrierEnglishAnalysisIn Depth Sub Topics (Level 4)USA
Consortium/Third-party administrators
InstituteNon-evidential alcohol screening devices - Motor CarrierEvidential breath testing device (EBT) - Motor CarrierDrug and alcohol policy - Motor CarrierFleet SafetyAlcohol testing - Motor CarrierDrug and Alcohol Testing - DOTDrug testing - Motor CarrierTransportationBreath alcohol technician - Motor CarrierFocus AreaEnglishAnalysisIn Depth Sub Topics (Level 4)USA
On-site audits of collection sites
InstituteDrug and alcohol policy - Motor CarrierAlcohol testing - Motor CarrierMedical review officer (MRO) - Motor CarrierFleet SafetyDrug and Alcohol Testing - DOTDrug testing - Motor CarrierTransportationFocus AreaDesignated employer representative (DER) - Motor CarrierEnglishAnalysisIn Depth Sub Topics (Level 4)USA
Providing collectors with necessary information
InstituteDrug and alcohol policy - Motor CarrierMedical review officer (MRO) - Motor CarrierDrug testing - Motor CarrierDrug and Alcohol Testing - DOTRefusal to be tested - Motor CarrierTransportationSplit specimen - Motor CarrierEnglishFleet SafetyFocus AreaDesignated employer representative (DER) - Motor CarrierAlcohol testing - Motor CarrierDilute specimen - motor carrerAnalysisIn Depth Sub Topics (Level 4)USA
Steps in the MRO’s verification process
How the return-to-duty process and Clearinghouse work together
InstituteDrug and alcohol policy - Motor CarrierMedical review officer (MRO) - Motor CarrierDrug testing - Motor CarrierDrug and Alcohol Testing - DOTTransportationReturn-to-duty drug and alcohol testing - Motor CarrierEnglishDrug and Alcohol Clearinghouse - Motor CarrierFleet SafetyFocus AreaDesignated employer representative (DER) - Motor CarrierSubstance abuse professional (SAP) - Motor CarrierAlcohol testing - Motor CarrierAnalysisIn Depth Sub Topics (Level 4)Follow-up alcohol and drug testing - Motor CarrierUSA
['Drug and Alcohol Testing - DOT']

- The Clearinghouse and return-to-duty processes go hand-in-hand.
The return-to-duty and Clearinghouse processes are two separate processes. However, there are several places where the two overlap.
Here is how the combined process would work, starting at the point the prohibited action (failing a drug or alcohol test, refusing a test, etc.) is discovered by the carrier and the driver is removed from all safety-sensitive functions:
- The carrier must provide the driver with an acceptable substance abuse professional (SAP) referral. Under DOT regulations, the carrier has no more responsibility at this point. As far as the DOT is concerned, the carrier can terminate or suspend the driver, or retain the driver in a non-driving status.
- The correct entity must make the Clearinghouse entry related to the prohibited activity.
- In the case of a positive drug test or a refusal situation involving the medical review officer (MRO), the MRO must make the entry.
- If the situation involves a positive alcohol test, an actual knowledge situation, a refusal involving the carrier, or alcohol use following a crash that required testing, the carrier must make the entry.
- Once the Clearinghouse entry has been made, the driver is listed as “prohibited” in the Clearinghouse.
- The Clearinghouse communicates the “prohibited” status to the driver’s state of licensing, resulting in a downgraded CDL.
- The first step in returning to driving is the driver completing an evaluation and treatment with an SAP. The driver must designate the SAP in the Clearinghouse allowing the SAP to enter completed steps. Once the evaluation and treatment process are completed, the SAP will enter this into the Clearinghouse.
- The driver must then pass a return-to-duty test. The carrier overseeing/accepting the return-to-duty test must enter the negative results into the Clearinghouse.
- Once the driver has completed the SAP process and passed the return-to-duty test, and both of these are entered into the Clearinghouse, the “prohibited” entry will be removed from the driver.
- Before operating a CMV again, the driver’s downgraded CDL must be reinstated. Check with the state of licensing on the procedures to reclaim the CDL once the driver is in a “not prohibited” status in the Clearinghouse.
- The driver must then complete all of the required follow-up tests. If the driver switches carriers before the follow-up tests are all complete, the new carrier must pick up where the previous carrier left off and complete the follow-up testing.
- Once the driver completes all follow-up tests required by the SAP, the carrier employing the driver at that time needs to enter that all follow-up tests are completed.
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