In recent years, the use of marijuana for both recreational and medicinal purposes has experienced a significant increase in several countries. As the legalization and social acceptance of this substance grow, more concerns arise among users about its detection in the body, especially in situations that require drug tests, such as the workplace or driving. As you probably know, one of the most common methods for detecting the presence of cannabis in the body is urine tests. This particular type of test has been widely used due to its relative ease of use, low cost, and ability to provide information on the presence of THC (tetrahydrocannabinol) in the body, the main psychoactive compound in cannabis. In this article, we will explore in detail how THC urine tests work, their advantages and limitations, as well as some factors that can influence the results. We will also address relevant aspects related to the duration of the detection of THC in urine and the legal and social implications associated with these tests.