Despite being stored in body fat, THC is only detectable for a certain amount of time. Many drug tests, including urine tests, look for 9-carboxy-THC which is the by-product of your body metabolizing the THC in your fat.
Marijuana ( pot, herb, weed, grass ) is the most commonly used and tested for drug in the United States and several other countries as well. Marijuana’s effects on the user and detection time depend on it’s strength or potency, which is related to the amount of THC(Tetrahydrocannabinol) it contains.
When you ask the question “How long does marijuana stay in your system?” you need to take into account the fact that there is no simple answer to this question. THC (Tetrahydrocannabinol) can stay in a person's body for as long as 3 to 90 days after smoking or being ingested orally. There are numerous determining factors for how long drug toxins stay in a persons body which vary from person to person, such as the analytical method used, your health, your body weight, metabolism, fluid intake, the type of drug toxin, and the degree of exposure to the drug toxin.
The speed at which marijuana leaves your body depends both on the speed of your metabolism, as well as on the half life of THC. It’s estimated that THC can have a half life that ranges anywhere from 1-10 days. It’s almost impossible to find out what that half life is, which means that it is very difficult to use it to calculate how long it will take for all of the THC to leave your body.
For this reason, when you ask “How long does marijuana stay in your system?” you have to realize that it’s very unlikely that you’ll be able to get a usable answer. The most common period of time is anywhere from 3-30 days, depending on your metabolism and the amount of marijuana that you’ve smoked....