It seems that you should know alot of lawyers who, with participants would be willing to sue the Government either criminally or civally consideering they knew since 1974 that marijuana cured certan cancers.
Have your team talked to anyone who fits into the 1974 study about forming a group and suing? One link to the 1974 study is below, new evidence is below it.

Government Study http://www.alternet.org/story/9257

Current Research http://www.ncbi.nlm.nih.gov/pubmed/19285265