How Do I Know If I Passed My Drug Test?

How do I know If I passed my drug test?: Waiting to get results from a drug test can be stressful. You may be wondering if you did enough to prepare or if certain factors could have impacted the results. While there is no way to know for sure until you get the official results back, there are some signs that can give you an indication of whether you passed or not. 

The time it takes to get the results back, how you felt during the actual test, and the steps you took to get clean all provide clues. Paying attention to these details can help ease your mind while you anxiously await those results. Of course, nothing is certain until you hear directly, but being informed on what to look for can make the waiting period a little easier.

In this article, we will see how you are confident about your drug test result. Also, what are the circumstances that can lead you to think that your test has failed? However, these are all assumptions and the final decision will come from the lab.

How Do I Know if I Passed My Pre-Employment Drug Test?

How Do I Know If I Passed My Drug Test?

Waiting after taking a drug test for a new job or pre-employment drug testing can feel agonizing. There are, however, some signs that can indicate if you’ve likely passed or failed:

  • Timeframe: Most pre-employment drug tests are 5-panel tests that are analyzed within 24-48 hours. If you haven’t heard back within 3 days, that’s a good indication you passed. A delay could mean they are reviewing and confirming a positive result.
  • Company reaction: If the company contacts you to start paperwork, set a start date, or discuss training, that implies you passed. However, a lack of follow-up or silence from HR is a potential red flag.
  • Test experience: If the specimen was clear and normal, the technician didn’t flag anything, and you did not disclose medications, the actual test likely went smoothly. Problems during the test itself, like an abnormal sample or disclosure of medications, could lead to further screening.
  • Detox efforts: If you have enough time before the test to detox, exercise to sweat out toxins, and drink fluids to dilute your urine, that can increase the chances of passing. Trying to tamper with or cheat the test could backfire.

In the end, no signs can guarantee a pass or fail. The only way to know for sure is to receive official word from the employer. Stay positive until you get final confirmation and continue focusing on the exciting prospect of this new opportunity.

How Soon Will I Know If I Failed a Drug Test?

You will usually find out if you failed a drug test fairly quickly. The timeframe for getting the results can vary, but it typically depends on the type of drug test you took and where it was conducted.

  • Urine Test: If you take a urine drug test, you might get the results within a day or two. This is one of the most common types of drug tests, and the results are usually available relatively quickly.
  • Saliva Test: A saliva drug test can provide results within minutes. Employers often use this method for on-the-spot or random testing.
  • Hair Follicle Test: Hair follicle tests take longer. Results may take several days to a few weeks because the sample needs to be sent to a lab for analysis.
  • Blood Test: Blood tests are more complex and can take a few days to a week for results. These are typically used in medical settings or for more comprehensive drug screening.
  • Instant Tests: Some tests, like instant urine or saliva tests, can provide immediate results on-site.

To know if you’ve failed, the test administrator or a medical professional will usually inform you. They will communicate the results to you in person or over the phone. If the test was for employment or legal purposes, your employer or legal authority may contact you to discuss the outcome.

Also, in some cases, you may receive a written report via mail or email. This document will detail the test results, including which drugs were detected and their levels. So if you’re concerned about the results, you can always ask the testing facility or your employer for clarification.

However, the time it takes to know if you failed a drug test varies depending on the type of test you took. Urine and saliva tests typically provide results quickly, while hair and blood tests may take longer. The method of notification can also differ, with some being immediate and others provided through direct communication or written reports.

What are the Different Color Tests for Drugs?

Different color tests are used to identify various drugs and substances. Also, each color corresponds to a specific drug or category of drugs. So here are some common color tests and their meanings:

Marquis Test (Mandelin Test):

  • Color: Marquis reagent turns purple or black.
  • Meaning: It’s used to detect the presence of amphetamines, MDMA, and opiates. The color change indicates the presence of these substances.

Mandelin Test:

  • Color: Mandelin reagent turns brown, black, or green.
  • Meaning: This test identifies the presence of opiates, amphetamines, and other substances, depending on the specific color change.

Mecke Test:

  • Color: Mecke reagent turns green, brown, or black.
  • Meaning: It detects opiates, amphetamines, and other drugs. The color change indicates the presence of these substances.

Simons Test:

  • Color: Simons reagent turns blue.
  • Meaning: This test is mainly used for the identification of primary amines, such as methamphetamine. A blue color change suggests the presence of these substances.

Froehde Test:

  • Color: Froehde reagent turns various colors depending on the substance, including brown, black, and blue.
  • Meaning: It’s used to test for a wide range of substances, including amphetamines, opiates, and hallucinogens.

Scott Test (Cobalt Thiocyanate Test):

  • Color: Scott reagent turns blue.
  • Meaning: This test is primarily for detecting the presence of cocaine. A blue color change indicates the presence of this drug.

Ehrlich Test:

  • Color: Ehrlich reagent turns purple.
  • Meaning: It is to identify the presence of indoles, such as LSD and other hallucinogens. The purple color change suggests the presence of these substances.

Dille-Koppanyi Test:

  • Color: Dille-Koppanyi reagent turns purple.
  • Meaning: This test is for detecting barbiturates. The purple color change indicates the presence of barbiturates.

These color tests are commonly used in drug testing and forensic analysis to quickly determine the presence of specific drugs or drug categories in a substance. The color changes are indicative of the substances present and help in their identification.


Can you check your drug test results online?

You may check drug test results online if the testing facility offers a web portal for result access.

If I take a drug test on Friday, when should I know the results?

Results for a Friday drug test typically come back within a few days, often by the following week.

If you fail a pre-employment drug test do they call you?

If you fail a pre-employment drug test, the employer usually contacts you to discuss the outcome.

How far back does a lab urine test go?

Lab urine tests can detect drugs used in the past few days to several weeks, depending on the specific test and drug.


While there are signs and timelines that can provide some insight into the outcome of a drug test, the only definitive confirmation comes from the official results provided by the testing facility or employer. It’s essential to remain patient and stay positive until you receive this official confirmation.

Also, color tests for drugs play a vital role in identifying specific substances, with each color change indicating the presence of particular drugs or categories. So these tests are valuable tools in drug testing and forensic analysis.

So be patient and wait for your report. You will definitely pass the test if you haven’t used any kind of drugs in the past or in the present. Good luck!

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