The detection of substances within the human body can be achieved through various biological samples. Two common methods involve analyzing urine and blood. These approaches offer different windows of detection and levels of sensitivity, influencing their suitability for specific applications.
The utility of these testing methodologies lies in their ability to identify substance use for a variety of reasons, including employment screening, forensic investigations, and monitoring treatment compliance. The historical application of these tests has evolved alongside advancements in analytical technology, leading to more precise and reliable results.