The next-largest quantities reported were of NPS, the largest seizures of plant-based NPS being of khat, followed by kratom. The largest seizures of synthetic NPS reported were of ketamine, followed by synthetic cannabinoids and synthetic cathinones. The largest quantities of ATS seized were of methamphetamine, followed by amphetamine and “ecstasy”. Overall, plant-based NPS seizures declined after 2010, owing to a decrease in the amount of khat seized.