Although this article is from 2010, the information is still relevant. We now have more data to oppose legalization of marijuana for any reason.
Links
[1] https://www.heritage.org/crime-and-justice/report/legalizing-marijuana-why-citizens-should-just-say-no
[2] http://rethinkpot.org/tags/stimson
[3] http://rethinkpot.org/tags/heritage-foundation
[4] http://rethinkpot.org/tags/talking-points