Researchers from the Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, and the Catalan Institute for Water Research (ICRA), Girona, collected samples of sewage water at the entrance to a wastewater treatment plant which processed exclusively the waste from a prison of about 3500 inmates. Samples were taken over several months, covering 10-day periods within a month and once a week for the remainder of the month to expose weekly trends and more long-term patterns.
The data indicated that methadone, alprazolam, ephedrine, cannabis and cocaine were taken daily by the inmates, whereas heroin, ecstasy, amphetamine and methamphetamine use was more sporadic. Certain drug-taking trends were visible from the results, separationsNOW reports.
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