You have google. You can look up the same sites I did. If you find ones with more current/ relevant data then post it. Or you can go edit the wiki pages then cite them. ;) As for the out of date 2008 study done here in Canada... haven't seen one like it since. However since e back when these types of studies were being funded some a$$h0l3s flew a few planes into some buildings and focus changed from drugs to terrorism rather heavily. ;)