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Omega Labs services include hair analysis for drug testing. http://www.omegalabs.net/
Aegis Sciences Corporation makers of the Zero Tolerance Drug Testing (ZTDT) products and services for individuals, organizations, and businesses. http://www.aegislabs.com/
High Standards Products Corporation reference standards and test kit for drugs of abuse testing, clinical toxicology, and therapeutic drug monitoring. http://www.highstandardproducts.com/
PharmChem independent laboratory providing integrated drug testing services to corporate and governmental clients. http://www.pharmchem.com/