The Hair Follicle Drug Test has a 90-day detection window, making it a reliable option for identifying drug use over an extended period. This test is ideal for individuals who need to undergo a more thorough drug screening, as it can detect drug use that may not be found in urine tests. It is commonly used in legal cases, workplace testing, and substance abuse programs. The test involves collecting a small hair sample from the scalp or body. Results are typically available within 3 to 5 business days.