Cambridge University is to pay drug users to take part in a medical trial.
Scientists have advertised for cocaine, crack-cocaine and amphetamine users to carry out research on the effects of certain chemicals on the brain.
Cambridgeshire Police said it could see no legal issues arising out of the advertisement or the research.
The university said issues surrounding the trial including drug users spending their “compensation” on illegal drugs had been carefully thought through.
Researchers, who have placed an advertisement in a local newspaper, said drug users would be “compensated for their time and inconvenience” and paid their travel expenses.
Det Ch Insp Gary Ridgway of Cambridgeshire Police said: “The police recognise that any research leading to a greater understanding of the effects of drug misuse is useful.”
