To stop advertisements going on. The very thing that dylan used for people to know about his music and love his music also advertising the drug that killed him. The bbc didnt buy any nitazenes and contacted all suppliers to ask why they were willing to provide illegal and dangerous products. Only six responded, saying theyd never sent the drug to the uk and didnt know it was illegal here. The Home Office say amounts reaching the uk remain low and a recent tightening of the law means suppliers can now face life in prison. Colin campbell, bbc news. Lets speak to caroline copeland, senior lecturer in Pharmacology And Toxicology at kings college. This we have just been hearing about how dangerous nitazenes are, been compared to heroin. For some people they will have never heard of them, can you explain to us more simply, what exactly do nitazenes do to the