Mephedrone. Banned but still available on the internet.

@article{Paoli2011MephedroneBB,
  title={Mephedrone. Banned but still available on the internet.},
  author={Giorgia de Paoli and Simon D Brandt and Derrick J. Pounder},
  journal={BMJ},
  year={2011},
  volume={342},
  pages={d1629}
}