The parts about cannabis are the least credible. The repoert claims (you have read this elsewhere) that the new 'skunk' makes cannabis some kind of dangerous addictive drug, whereas the old grass and presumably cannabis resin, which the report admits has been around for over a thousand years, was relativley harmless.
They claim that Dutch 'skunk' THC levels reached 20% in 2003/4 and then dropped to 18% in 2004/5 (!). Good cannabis resin has had THC levels of 20-25% for a very long time. This is politics not science-- the UN bowing to US prsessure as usual.
They think this is a justification for prohibition, yet they admit cannabis does not cause deaths.