From the Research
A DOT driver can potentially pass a DOT physical examination even if they admit to failing a non-DOT drug screen, as the DOT is primarily concerned with current impairment and safety risk, not past failures on non-DOT tests. The DOT testing program operates independently from non-DOT drug screens, with its own specific protocols and standards. If a driver has addressed the issue that caused the previous non-DOT failure (such as stopping drug use), has allowed sufficient time for the substance to clear their system, and can now pass the DOT test, they may be certified to drive. However, honesty about past failures is important, as employers may have policies requiring disclosure of previous failed tests.
Some studies have shown that certain medications, such as naltrexone, can affect the results of drug screens 1. Naltrexone is an opioid antagonist that is FDA approved to treat alcohol dependence and opioid dependence, and it can cause false-positive results for oxycodone on urine drug screens. However, this is not directly relevant to the question of whether a DOT driver can pass a DOT physical examination after failing a non-DOT drug screen.
The key factor in determining whether a DOT driver can pass a DOT physical examination is their current fitness for duty, not their past failures on non-DOT tests. Drivers should be aware that different substances remain detectable for varying periods: marijuana can be detected for weeks, while cocaine, amphetamines, and opioids typically clear within a few days 2. If the previous failure was due to prescription medication, having proper documentation from a prescribing physician may help explain positive results on current tests.
In terms of the impact of naltrexone on drug use, some studies have shown that it can be effective in reducing the abuse liability of amphetamine and cocaine 2. However, this is not directly relevant to the question of whether a DOT driver can pass a DOT physical examination after failing a non-DOT drug screen. The most important factor is the driver's current fitness for duty and their ability to pass the DOT test.
It's also worth noting that the use of naltrexone for addiction treatment is becoming more common, and it's being prescribed more frequently in recent years 3. However, the use of naltrexone is not a guarantee that a driver will pass a DOT physical examination, and each case should be evaluated on an individual basis.
Overall, the ability of a DOT driver to pass a DOT physical examination after failing a non-DOT drug screen depends on their current fitness for duty and their ability to pass the DOT test, not on their past failures on non-DOT tests.