Originally posted by: Cuchulainn
drugs in water
The amount peaks on Friday and Saturday, sampling by the Lisbon-based European Monitoring Centre for Drugs and Drug Addiction showed.
Then it falls off as the drug-using population recovers on a Sunday, and continues to go down as they return to work on Monday.
The research found levels in London slightly higher than those in Amsterdam, with 737 mg for every 1,000 people in the British capital compared to 716 mg in the Dutch city. The next city in the league was Antwerp in Belgium, at 632 mg.
They did not correct for differences in water use and efficiencies. If one city simply uses more water per capita, it's drug concentrations would be diluted.