1. Lewin AH, Seltzman HH, Carroll FI, Mascarella SW, Reddy PA. Emergence and properties of spice and bath salts: a medicinal chemistry perspective. Life Sci. 2014;97:9–19.
2. Helander A, Bäckberg M, Hultén P, Al-Saffar Y, Beck O. Detection of new psychoactive substance use among emergency room patients: results from the Swedish STRIDA project. Forensic Sci Int. 2014;243:23–9.
3. EMCDDA, New psychoactive substances in Europe. An update from the EU early warning system (March 2015). 2015. Available at (last accessed 06/02/16): http://www.emcdda.europa.eu/attachements.cfm/att_235958_EN_TD0415135ENN.pdf .
4. Stark M, Payne-James J, Scott-Ham M. Symptoms and signs of substance misuse. 3 ed. Boca Raton FL: CRC Press; 2015.
5. Psychoactive Substances Act 2016. Available at (last accessed 10/07/16): http://www.legislation.gov.uk/ukpga/2016/2/pdfs/ukpga_20160002_en.pdf .