Intrvne™ Test Strips operate by enabling a small sample of a substance to engage with responsive chemicals on the strip's surface. When the substance contains fentanyl, these chemicals trigger a distinct reaction, resulting in the formation of visible lines or marks. Conversely, the absence of these lines typically suggests the absence of fentanyl. This straightforward yet efficient procedure furnishes users with valuable insights into the possible presence of fentanyl within a specific substance, assisting them in making more informed decisions regarding its consumption.