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There are reports of cocaine being detected in waste water (1). You could approach water companies to see how granular their data is. Perhaps you can see that t

• IkmoIkmo 9y ago
  You'd probably just get a heatmap where there is little use of water. i.e. a single individual doing cocaine in a suburb would show far greater concentrations than 100 people doing cocaine at a rave at some farm that's irrigated on a daily basis, or 100 people doing cocaine at a wall street office party above a bunch of laundromat companies.