The process of analyzing biological specimens, such as urine, blood, hair, or saliva, to detect the presence of specific substances within the city limits of San Antonio is a service offered by various clinics and laboratories. For instance, an employer in the transportation industry might require pre-employment screening to ensure adherence to safety regulations.
This type of analysis is important for maintaining workplace safety, ensuring compliance with legal mandates, and promoting public health. Its application has grown from strictly regulated industries to encompass broader sectors, reflecting a wider societal concern for substance misuse and its associated consequences. Historically, this practice emerged from concerns about employee performance and safety-sensitive occupations.