These diagnostic tools analyze oral fluid to detect the presence of specific substances. They offer a non-invasive method for substance detection, utilizing readily accessible biological samples. Results generally indicate recent substance use, typically within a window of a few hours to a few days. For instance, these devices can reveal recent cannabis consumption based on the presence of THC metabolites in the saliva.
These screening methods are valuable for workplace drug testing, law enforcement, and clinical settings due to their ease of administration and reduced potential for adulteration compared to urine-based tests. Their historical development reflects advancements in immunoassay technology, leading to improved sensitivity and specificity. The benefit lies in the quick turnaround time and simplified collection process, enabling on-site testing and immediate results.