Prime Screen has more than 99% accurate in detecting 5 different specific drugs. Easy to read urine dip card, one red line means the result is positive for corresponding drug, two lines means negative. Accurate and Reliable - 510(k) Cleared for Home Use (OTC Use) and professional use. Over 99% accurate in detecting 5 drugs according to the recommended cut-off level: AMP-1000ng/ml, COC-300 ng/ml, MET-1000ng/ml, OPI-2000 ng/ml, THC-50 ng/ml.