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Drug Test FAQ

Most drug tests are conducted in one of two ways: through a urine test (urinalysis) or a hair test. The lab tests do not look for the drug itself, but rather, for the drug metabolites—this refers to the products resulting from the metabolism of the drug.

For example, THC (technical name: 11-nor-D-9-tetrahyrocanibinol), the psychoactive ingredient in marijuana, breaks down into 31 different metabolites, the most prevalent being 11-nor-D-9-tetrahyrocanibinol acid, or THCA. A drug tests looks for these metabolites as evidence that the person being tested has used marijuana.

The metabolites from some drugs rapidly leave the body. Ethyl Glucuronide (EtG), the metabolite used to detect alcohol, for example, is generally not detectable beyond 72-80 hours.

Unlike alcohol, marijuana is detectable for much longer. This is because it is liposoluble, meaning it is absorbed into the fat cells. Marijuana passes from the lungs (when smoked) to the blood stream, and is absorbed into fat cells where it is stored until the body burns the cells for energy. This can take quite a while, which is why the drug can be detected in the body for up to 30 days when a person has consumed a substantial amount.

What to Know About Urine Drug Tests

Drug Screen vs. Drug Test
There is a big difference between a drug screening and a drug test. Drug screens are much less costly than drug tests, which is why many companies opt for them. Drug screens are highly reactive, meaning that they can reliably “react” to the presence of drugs. The major drawback of drug screens is that they often produce false positives, detecting the presence of a legal drug, such as ibuprofen, without distinguishing it from an illicit drug like cocaine or methamphetamine.

A drug test (versus a screen) more accurately detects the presence of illegal drugs, as it is both reactive and selective. Drug tests are more accurate and result in false positives much less frequently, but they are more expensive. They also require more sophisticated analysis and expertise on the part of the tester, and the results take longer to come back.

False Positives
If a drug screen produces a false positive result, it may be followed up with another test called a gas-chromatography mass spectrometry (GC-MS) to confirm the result, especially if the person being tested denies drug use.

How Long Are Drugs Detected in Urine?
Here’s a snapshot of how long some common drugs can be detected in urine:

  • Amphetamines: 1 to 2 days
  • Barbiturates: 1 day to 3 weeks
  • Benzodiazepines: 3 days to 6 weeks
  • Cannabinoids (THC): 4 days to 30 days
  • Cocaine: 2 to 4 days
  • Methadone: 3 days
  • Methamphetamines: 2 to 10 days
  • Opiates: 2 days
  • Phencyclidine (PCP): 14 to 30 days


When Are Drug Tests Used?
Drug tests are used for a variety of reasons and in a variety of settings, including:

  • By primary care doctors: If the doctor suspects a patient may have a drug or alcohol problem he or she will conduct a test. Emergency room doctors may also order drug tests to determine whether a patient is under the influence of drugs in order to provide the right medical treatment. This information may also be needed by law enforcement, especially in situations involving auto accidents. If a patient is behaving erratically, violently, or otherwise presents a danger to themselves or others, the ER doctor may order drug tests.
  • By employers: Employers commonly require prospective employees to get a drug test as a prerequisite to hiring, and they may also conduct random drug tests during employment.
  • By parents: Parents may ask their teens to take a drug test to prove they are not using.
  • By drug and alcohol rehab centers: Staff members at rehab facilities routinely test residents to ensure they haven’t relapsed.
  • By law enforcement: Parolees and those on probation for a drug-related offense may be required to take routine drug tests as a condition of their parole/probation.


What to Know About Urine Drug Tests

The Problem with Drug Testing
Drug tests are not infallible, and many see them as an invasion of privacy.

It’s perfectly reasonable for an employer to expect employees to be alert, sharp, and productive on the job, especially employees who operate machinery or whose jobs require acute concentration, such as air traffic controllers. However, it’s a common misconception that drug testing measures impairment. In reality, a drug test simply provides evidence of past drug use that has no relation to on-the-job performance.

Most drug tests completely disregard alcohol, but are highly sensitive to marijuana. Additionally, because drugs like cocaine are flushed from the body in a short period of time, someone who uses this drug fairly frequently gets a “pass,” while an occasional nighttime marijuana smoker gets a “fail.”

There are alternatives to blanket drug testing every employee. Computer video game tests, for example, could be used to measure concentration and actual reaction times—a more accurate measure of impairment.

Passing a Urine Test or Other Drug Test
Regardless of the true efficacy or fairness of drug testing, most of us will be required to take a drug test at some point in our lives, either as a condition of employment, or for another reason.

The good news is that there are options for those who are concerned about testing drug free. These include:

  • Urine Additives: Ideal for on-the-spot use during random urine tests, urine additives destroy toxins on contact.
  • Synthetic Urine: A concentrated urine substitute, synthetic urine has become so sophisticated it is guaranteed to pass a drug test, even a gas-chromatography mass spectrometry (GC-MS) test.
  • Detox Formulas: Sold in drink form, similar to a sports drink, detox drinks work by preventing the body from releasing toxins into the urine. They can work in as little as 60 minutes prior to a test and last for up to 5 hours.
  • Hair Follicle Products: Ridding the hair of toxins, hair follicle shampoos can help you pass a drug test and are guaranteed to work. Cut hair samples remain free of toxins forever.
  • Saliva Products: There are several fast-acting saliva products that can help you pass an oral saliva test, including mouthwash and a special gum.


Don’t let a drug test prevent you from landing your dream job, ending an existing one, or otherwise damaging your personal or professional life. Cleartest offers a variety of products guaranteed to help you pass your next drug test.

View all of our clean drug test products.

1 Substitution: Use our urine, not yours!

To pass any drug test, use our concentrated synthetic urine substitute. Drug testing relies on the pee testers running a drug test, or drug screen, on your urine to test for drug metabolites. If you want to pass a drug test for marijuana or for any substance, we highly recommend concentrated synthetic urine substitute.

We carry the finest concentrated synthetic urine substitute in the world, thoroughly tested and quality controlled. Accept no substitutes. Concentrated synthetic urine substitute is guaranteed drug free. Use our concentrated urine and you will pass the drug test. There has never been a drug test failure using concentrated urine.

Concentrated synthetic urine substitute has been used successfully by thousands to pass the drug test. We sell only the best drug free concentrated synthetic urine substitute produced by libertarian activists intent on protecting your constitutional right to privacy.

Concentrated synthetic urine substitute is mixed with warm water prior to the drug test and delivered at body temperature. It is a completely undetectable way to pass a urine drug test. The reason concentrated synthetic urine substitute never fails is because it is not your urine. It is guaranteed drug free synthetic urine manufactured in a laboratory.

You will pass any drug test using concentrated synthetic urine substitute. Mix the urine with warm water prior to the test, place in a small plastic bag or condom, and keep it next to your skin to keep it warm. Complete directions come with the product.

Concentrated synthetic urine substitute comes complete and ready to use, you need purchase nothing else. However, we recommend The Urinator as the perfect compliment to concentrated synthetic urine substitute. It’s the best method to deliver your sample at the proper temperature.

2 Additives: Add a chemical to disrupt the drug test

Great for random tests and easier to use than concentrated urine, additives are the most common method of defeating the urine test. Additives work in two different ways. Some act chemically to destroy toxins in the urine and some block the capability of the test to detect toxins in the urine.

We have tested several additives currently on the market and believe that Instant Clean Add-it-ive and Urine Luck are the finest products being sold today. The products come in a 6 mL micro-vial, about the size of a pinky finger, that is easily concealed. It will destroy all toxins in a urine sample. It will work on the EMIT test or the GC-MS test. It will even destroy prescription medications, so you don’t need to list prescription drugs you are taking. It is pH balanced.

We believe these are the best additives on the market today. Independent laboratory tests have proved negative for all drugs. Both of these products have been on the market since 1993 and have helped many thousands of people pass their tests. The formulas are constantly changed to keep ahead of the bladder cops. We highly recommend these additives. Both carry a 200% money back guarantee from the manufacturers.

3 Detoxification: We carry the finest detoxify products and have extensive experience with their use

The third way to beat the drug test is to detoxify your system to a threshold below the drug test limits. We carry a complete line of detoxifying products to help you defeat the urine drug test.

We carry the industry’s leading quick acting products: Absolute Detox, Absolute Detox XXL, Pre-Tox, Quick Flush, and Green Clean. These carbo drinks and capsules work in about one hour.

Absolute Detox is for normal body weights and toxin levels. Absolute Detox XXL is for higher toxin levels or larger body weights. Quick Flush capsules are discreet, small caps taken with water. Green Clean is a discreet concentrated liquid drink. Quick Fizz is an effervescent drink for both urine tests and saliva tests.

Is There Anything I Can Do If I Fail a Drug Test?

Yes, call us immediately! The tests companies use today are extremely flawed. If you fail a test, deny that you have used any illegal substance and insist that there must be something wrong with the test.

Urine tests are unreliable. Many people who have never done drugs have tested positive for drugs because the tests are inaccurate. Demand a second test. They should always give you one. Sometimes a more expensive test will be used if you are being tested for the second time and have raised suspicion, in which case you will want to use concentrated synthetic urine substitute.

A concentrated synthetic urine substitute will work on any test. It is pure, drug-free urine. It has been used successfully by thousands of people. The product comes with directions on how to use it.


Read more about this here Is There Anything I Can Do If I Fail a Drug Test?

There are more than 250 over-the-counter medications and prescription drugs that could cause a false positive.

Filling out the lab test form to include over the counter medications that cause the same positive results as the illegal drug that might be consumed would be a good idea. If a positive result occurs on the test, a basis will have been laid for an appeal. Remember that the negative error rate is just as large or larger than the positive error rate. Many people using drugs escape detection.

Pain relievers such as Advil, Nuprin, Motrin, Midol, Trendar and Ibuprofen are known to cause false positives for Marijuana use. Secondhand smoke inhalation from a rock concert or from being with someone who is smoking marijuana could also cause a false positive for THC. Hemp seed products, such as hemp burgers or food products containing hemp oil will also cause false positives for THC. Twelve ounces of hemp seed products ingested before a test will cause you to fail your test and has held up as a defense in at least two federal court cases.

Dristan Nasal Spray, Neosynephren, Vicks Nasal Spray, Sudafed and other medications containing ephedrine or phenypropanolamine could cause a false positive reading for Amphetamines.

Vicks Formula 44M containing Dextromethorphan, and Primatene-M containing perylamine as well as the pain reliever Demerol, Quinine water, poppy seeds and prescription anti-depressant Elavil will cause a false positive for opiates.

Nyquil Nighttime Cold Medicine will cause a false positive for Methadone.

Antibiotics such as Ampicillin and Amoxicillin will cause a false positive for cocaine.

Diasepam as well as Dextromethorophan (an ingredient in some cough medicines) will cause a false positive for PCP.

Whether you are using the additive or the carbo drinks you will want to drink as much fluid as possible a couple of days prior to the test. This is especially important for the carbo drinks. Water, tea, soft drinks, etc. are fine. Drink 3 to 4 quarts of fluid. On the day of the test, cut back your fluid consumption to a normal level. Excessively diluted urine samples will cause suspicion.

Never give the testers your first urine of the day. Toxins build up overnight and are heaviest in the morning. If possible void the first and last portion of your urine stream into the toilet. Only catch the middle of your urine stream for the sample. This portion will have the lowest amount of toxins.