MD-Bio Xylazine Test Strips are the easiest, fastest and most accurate way to detect trace amounts of xylazine (also known as 'tranq') in packaging, pills, on surfaces and more. Once a test has been run, result interpretation is simple! One or two pink lines will appear on the Xylazine Test Strip to indicate whether xylazine has been detected. One line indicates a positive detection for the presence of xylazine. Two lines indicate a negative detection and that xylazine has not been detected.