How long before a bad test is of your record
Through Disa.

According to this... you would be required to successfully complete a drug rehab program before being able to be certified. It however will remain on the record for far longer. Unable to find an exact answer to that portion if it would ever be removed..

http://nrcme.fmcsa.dot.gov/mehandbook/sub_abu4_ep.aspx


Actually here is the detailed rules and regulations pertaining to this in its entirety.

http://www.fmcsa.dot.gov/rules-regulations/administration/fmcsr/FmcsrGuideDetails.aspx?menukey=382


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< 382.413 382.503 >
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Subpart E - Consequences for drivers engaging in substance use-related conduct

§382.501 Removal from safety-sensitive function.

Question 1: What work may the driver perform for an employer, if a driver violates the prohibitions in subpart B?

Guidance: A driver who has violated the prohibitions of subpart B may perform any duties for an employer that are not considered ''safety-sensitive functions.'' This may include handling of materials exclusively in a warehouse, regardless of whether the materials are considered hazardous as long as safety-sensitive functions are not performed. Safety-sensitive functions may not be performed until the individual has been evaluated by an Substance Abuse Professional (SAP), complied with any recommended treatment, has been re-evaluated by an Substance Abuse Professional (SAP), has been allowed by the Substance Abuse Professional (SAP) to return to work and has passed a return to duty test.