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How Long Does Weed Stay in Your System?

03 April, 2024

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How long does weed stay in your system may be a question some people want an answer to. Delta-9-tetrahydrocannabinol, or THC, is one of the metabolites of cannabis. The drug and its metabolites remain in the body for varying periods, depending on several factors. Generally, drug testing methods can detect THC for up to 30 days after the most recent use for regular users. Meanwhile, it is up to 10 days after the last consumption for casual or occasional users.

Typically, casual and daily users or those facing a drug test want to know how long the illicit substance remains in the body. The information can help them make informed decisions regarding marijuana use, especially if they are subject to cannabis drug testing. Medical professionals also need it when assessing health or prescribing medication. The following sections will explain how the body metabolises the drug, the factors affecting the detection period, and the common types of drug tests.

How Long Does Weed Stay in Your System – Explanation of How Cannabis is Metabolised in the Body

People know cannabis as weed or marijuana. They commonly use it as a recreational drug. Many wonder how long does weed stay in your system. The answer to this question depends on several factors. When they consume the illicit substance, THC, the main psychoactive component of cannabis, is absorbed into the bloodstream and distributed throughout the body. From there, it undergoes metabolism.

Once THC enters the body, the liver rapidly metabolises it into various compounds, the metabolites. The primary metabolite is 11-hydroxy-THC, which contributes to the psychoactive effects. This metabolite is further broken down into another compound called 11-nor-9-carboxy-THC. It is not psychoactive, but professionals utilise it as a marker to detect cannabis use in drug tests.

The half-life of THC, the time it takes for half of the drug to be eliminated from the body, is usually between one to two days. However, the metabolite can persist for much longer. Chronic cannabis or regular users may have detectable levels of THC in their system for up to a month. Ultimately, it depends on various factors such as frequency of use, dosage, metabolic rate, and body fat percentage.

Importance of Testing for Weed

  • Road safety: Cannabis roadside drug tests can help reduce impaired driving.
  • Promote productivity: Drug screens aid employers in identifying employees who may be less productive due to marijuana use. Regular testing discourages drug use, helping promote a focused and efficient workforce.
  • Company protection: Workplace drug tests maintain a secure working environment.
  • Prevent liability risks: Implementing drug testing policies allows companies to demonstrate that they take steps to prevent accidents or injuries caused by employees under the influence of marijuana. Then, this can help minimise legal and financial consequences.
  • Legal compliance: Businesses with cannabis testing can comply with federal and state regulations.

A urine test kit with a container filled with urine sample

How Long Does Weed Stay in Your System – Factors Affecting Detection Times

The question of how long does weed stay in your system is a common concern for individuals who are subject to drug testing. The detection time of THC varies due to several factors. For instance, the method of consumption can affect the period because the way the body metabolises and stores THC differs depending on whether people smoke, ingest, or vaporise it.

Moreover, the frequency of consumption can influence the length of time THC remains detectable in the body. It differs between heavy, light and non-cannabis users. Daily cannabis users or heavy users may have traces of THC in their system for up to 30 days or more. On the other hand, occasional users might only have detectable levels for a few days.

Other factors that affect how long weed is identifiable are individual factors like metabolism rate and hydration levels. People with faster metabolism rates usually eliminate the drug more rapidly. Meanwhile, a low level of hydration in the body can slow down the process of elimination, leading to a longer detection window. Furthermore, the method of drug testing can also impact the detection time.

Types of Cannabis Products Consumed

Individuals consume various types of cannabis products. These include dried flowers, concentrates, edibles, and topicals. Each of these products contains different levels of cannabinoids, such as THC and CBD, which can affect detection times in the body.

Regular users smoke or vaporise dried flowers. It has a relatively short detection time of a few hours to a few days. Cannabis concentrates, such as oils, waxes, and shatters, can stay longer in the body. Edibles that people consume orally remain in the system for several hours to days. Finally, cannabis topicals, such as creams and lotions, have minimal systemic absorption, resulting in very short detection times.

A woman conducting a saliva test on a person

How Long Does Weed Stay in Your System – Types of Drug Tests Used to Detect Cannabis

To estimate how long does weed stay in your system, it is crucial to understand the different drug tests used to detect cannabis or THC metabolites. One of the most common testing methods is urine testing. Weed can remain in urine samples at various times. Moderate users may test positive for up to one week after use. Meanwhile, regular users can test positive for up to 30 days.

Another type of test to detect THC levels is the blood test. Weed remains detectable in the bloodstream for a relatively shorter period than urine. Infrequent users may test positive within 24 to 72 hours after use, while frequent users may remain positive for up to seven days. Hair tests can identify the drug in hair follicles for up to 90 days after use.

Lastly, saliva testing is becoming increasingly popular in detecting recent cannabis use. Technicians can identify the drug in saliva samples for a shorter duration than other tests. Police officers usually use saliva tests in random roadside drug testing because they can detect recent use within the past 14 hours. Also, the screen does not require special equipment.

Detection Windows for Different Types of Tests

The window of detection for cannabis varies depending on the type of test. For urine drug screening, professionals can detect the substance for up to 30 days after use. Then, it is around 24 to 72 hours after use for saliva tests. Blood tests also have a shorter detection window, usually 2 to 7 days after use.

Cannabinoids in hair last much longer, with traces of cannabis being detectable for up to 90 days after intake. The reason is that THC and other cannabinoids are absorbed into the hair follicles and remain there as the hair grows out.

Conclusion

The liver is crucial in breaking down and processing substances that enter the body. When cannabis enters the liver, the organ breaks it down into THC metabolites. How long does weed stay in your system can vary depending on several factors. One of the primary factors affecting the detection period is the method of consumption. Also, the frequency significantly impacts the timeframe. Chronic users may have THC metabolites detectable in their system for a much longer period than occasional users.

Also, the type of drug test influences how long weed remains in the body. For example, urine drug screens can detect THC metabolites until 30 days after use. Meanwhile, blood testing has shorter detection windows of 1-2 days. Saliva tests can detect THC for up to 14 hours. Hair follicle tests can detect THC for up to 90 days. Considering these detection times and the specific testing requirements is necessary when determining how long cannabis may be detectable.

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