Check the listing for details. 25 Pack Marijuana THC Weed Urine Drug Test Strips - FDA Approved - Free Shipping. Condition: New. Listed at 12.99 USD. View more great items THC Urine Dip Strip Test 25 Individually wrapped testsWondering if your family members or employees are using Marijuana Product Description:FDA Approved Drug screen test strip that tests for-THC-MarijuanaTest is easy to administer and interpret results, with a 99% accuracyInexpensiveDetects Drugs in Urine for Up to 3-4 DaysCutoff: 50ng/mlInstructions:Remove the test panel from the sealed pouch and use it within one hourImmerse the strip into the urine with the arrow pointing towards the urineTake the strip out after 3 seconds and lay the strip flat on a clean, dry, non-absorbent surface.Read the result in 5 minutes Results: Negative: Two distinct colored lines appear. One colored line should be in the control line region (C), and another colored line should be in the test line region (T). Positive: One colored line appears in the control region (C). No line appears in the test line region (T). INVALID: Control line (C) fails to appear. Insufficient specimen volume or incorrect procedural techniques are the most likely reasons for the control line failure. Review the procedure and repeat the test using a new test. On Jan-18-18 at 14:55:23 PST, seller added the following information: