The report – by the Royal Society for the Encouragement of Arts, Manufactures & Commerce (RSA) – will be published in March.
It has been drawn up by a commission of lawyers, police officers, academics, drugs workers and members of the business community.
The RSA is examining the relationship between public policy and the use and abuse of illegal drugs, as part of its attempt to foster better communities.
RSA project director Susie Harries said: ‘The report represents a fresh take on the treatment by the law of drugs and drug-users.’
It is the second piece of RSA business that Lexington has landed in the past year, having been brought in on a six-month contract to support a climate change campaign.