Customer Service: Pprofessional and experienced customer service team based in the USA. If any questions about this drug identification test kit, please feel free to the toll-free service. Easy & Clear to Read: 2 lines appearing indicates negative result. Only C line appearing indicates positive result. No line or only T line means the test is invalid. Please retest with a new drug of abuse test device. Easy & Quick to Use in Minutes: Dip the drug test, check the results at 5 mintue! Easy to use and comes with free urine cup, you can do this multi drug detection alone any time all day at home or office. it's very convenient!. Accurate & Reliable: This 5 panel one step multi-drug screen test dip card has hospital quantity and over 99% accuracy. The varying ranges of urinary specific gravity do not affect the test results. With 510K and Clia Waived certificated. Home & Professional Drug Test Kit: Specially Designed for Self-test and Professional test use at home, work, school, clinic, rehab center. Same Technology used in labs. Check health, keeping healthy!.