Hair drug testing detects the marijuana parent metabolite lodged inside the hair shaft and excludes external contamination as a possible source of a positive result. The detection window for cannabis in hair drug testing might be as low as 1 pg/mg. Higher levels of marijuana use may produce false positives because proteins in marijuana change their shape when heated like those in blood, sweat, and other body fluids, causing them to bind to certain drugs.
Testing for marijuana in urine has several major limitations as a means of workplace drug testing. Marijuana is quickly eliminated from the body within hours of use, so a negative test does not guarantee that an employee did not use marijuana during the previous night or day. Employees can also dilute or hide marijuana use by drinking plenty of water and taking diuretics - drugs that make you pass out often- which are available over-the-counter at any grocery store. Finally, since marijuana is legal in some states but not others, even employees who work for companies based there would be violating federal law if they were tested regularly for marijuana use.
In conclusion, marijuana use can be detected in your hair for up to three months after you last used it. However, since drugs are absorbed into the body through our skin, it's possible to test positive for marijuana use without actually being under the influence of it.
To test positive for marijuana use in a urine drug test, just 20 to 50 nanograms per milliliter of THC are necessary. Hair drug tests, on the other hand, may detect as little as 1 nanogram per milliliter, making them far more accurate in identifying marijuana.
If you've been among drug users without taking them yourself, you'll almost certainly pass a hair follicle drug test—or any other drug test for that matter. Secondhand smoking includes a process known as "passive exposure."
So, under the preceding scenario, you have a decent probability of passing your hair drug test. However, if you are a heavy user, you will fail your drug test. To test positive for marijuana use in a urine drug test, just 20 to 50 nanograms per milliliter of THC are necessary. If you have failed a drug test before, you know that even a small amount of marijuana can cause a positive result on a drug screen.
The same is true for a hair sample test. If you have failed a previous hair sample test, even if it was for something else, there is a good chance that you will fail again this time around as well. The only way to guarantee a negative result on both a urine and hair sample test is not to use marijuana.
If you want to find out more about what would happen if you failed a drug test, how you could have succeeded before and what you could do to avoid failing again, keep reading. We also talk about what would have happened if you passed a drug test but someone else did not. That situation is different than failing a drug test because it means that you did not use while standing over a toilet peeing.
First, let's look at what would have happened if you failed a drug test. You used marijuana recently enough that it showed up in your urine or blood sample.
This is only formed when marijuana enters the body directly (rather than indirectly through second-hand smoking) and is broken down by the body. The hair test will not detect outside pollutants. However, it can reveal how recently you used marijuana by looking at how old the THC was when it entered your system.
THC is the primary psychoactive compound in marijuana and remains in your body for several days. As such, it is possible to show up on a drug test even if you have recently used marijuana. For example, if you consume marijuana daily and then go on a vacation where they allow drinking only water and no alcohol, you could still show up positive for marijuana on a subsequent drug test.
The best way to avoid testing positive for marijuana is not to use it. If you do choose to use marijuana anyway and want to hide its presence from your employer, here are some things you should know:
Marijuana metabolites stay in your body for many days. So even if you stop using it yesterday, you could still test positive for marijuana today.
To minimize the amount of time it stays in your body, use marijuana carefully and sparingly. Also, try not to use more than what you need so that your body doesn't have time to break down much of the drug before your urine test comes out.
What is the purpose of a hair drug test? Typically, hair drug tests look for cocaine, marijuana, opioids, methamphetamine, ecstasy, and PCP. A hair test can also check for alcohol.
Hair samples are preferred over blood samples because they are less invasive and easier to get in some cases. However, hair samples cannot show use in the recent past (within several months), so they do not replace urine tests or act as a way to screen individuals who may have difficulty giving consent for a blood sample.
Does everyone's hair grow at the same rate? No, hair grows at its own pace depending on your body's health and various other factors. Hair growth is generally divided into two stages: an active stage and a resting stage. During the active stage, which lasts about three years, your hair grows at its fastest rate. After this period, the rate of growth slows down until the next cycle begins. This means that if you stopped growing your hair today, it would stop within three years.
Why does my hair seem thin even though I eat well and take care of myself? If you're eating well and taking care of yourself but still feel like you have a low-budget haircut every time you wash your hair, there could be another cause for your thinning hair.
Cannabis usage may be detected using hair testing, and it is usually included in the standard hair test. Hair tests typically utilize the most recent 1.5 inches of growth for testing. This gives a detection time of about 90 days. However, drug activity prior to that point may be found if more sensitive testing methods are used.
Hair samples can be collected from any part of the body with hair, but since cannabis users often smoke or otherwise administer drugs through their nose or mouth, these are the parts of the body usually involved. The scalp is also sometimes affected by THC exposure so sampling from there may yield positive results as well. Hair samples may be kept indefinitely if they are in protective plastic bags sealed under vacuum. Freezing works well for preserving the integrity of the sample.
Once dried out, hair loses its strength and becomes brittle. If you want to keep your hair long, then you should try not to use marijuana or other drugs that affect your hair health.
In conclusion, marijuana stays in your hair for up to 90 days. If you want to pass a drug test, then you should stop using it as soon as possible. This will help you prove that you were not using recently and therefore would not show up on a drug test.