Fentanyl

       Fentanyl is a drug that is often sold as opiates or benzodiazapines. It is a depressant, and has similar effects to these substances. It is used because it is much cheaper than any alternative. However, it is incredibly potent, and is diluted before being sold as other substances. But it is easy to misjudge how much fentanyl you're adding into heroin or putting on a pill, and even one extra drop can lead to a person overdosing from what they were told would be a safe recreational dose. Fentanyl is also the reason for the presence of areas in a substance (usually heroin) that are seemingly much more potent than the rest, or a "hot spot". You can buy fentanyl test strips HERE.