The information on this website is not intended as medical advice; Dr. Weinstock is a physician but not YOUR physician. While we advocate for the life-saving potential of tools such as fentanyl test strips and naloxone, BirdieLight is not the manufacturer of these tools, and no tool is 100% accurate all the time. BirdieLight makes no representations that these tools are 100% accurate; any reliance you place on them is strictly at your own risk. Please keep in mind that while fentanyl test strips are a powerful detection tool for the potentially-lethal presence of fentanyl in illegal pills and powder, the strips have been determined to be 92-96% sensitive in detecting fentanyl. Remember, never use any substance when you are alone (tell a friend you are taking something!) and that friend should always know where the naloxone (Narcan) is.