Haha dude i'm actually writing a paper on the same thing... I actually narrowed it down to marijuana being legalized for medicinal purposes. I wouldnt go for the broad topic of just legalizing marijuana b/c its tough to write a long essay about it(mine was a minimum 6 pages)and keep it flowing w/ all the different aspects of it.
DEFINITELY buy Jack Herer's "The Emperor Wears No Clothes." Not only does it thoroughly explain why hemp would be beneficial to legalize, but the medical benefits of marijuana, history behind its illegalization, and disproves almost every myth of how marijuana harms the body.
I'll letr you copy mine if you want. haha.
this is what I was gunna say.... your topic is too broad, your gunna have a hell of a time. there is plenty of reasearch and shit you can find on a more specific topic. like medical marijuana, or stricly hemp, or a comparative of marijuana to alcohol and other drugs.
I would really narrow it down in order to get good information and have a better chance of haveing the teacher take it seriously and possibly conducting their own research to find out more about marijuana.
Every single paper I've been assigned in my 15-17 years of schooling now, I tie to marijuana prohibition in some way or another. I'm always trying to reach out to more people, and by tieing things to marijuana, it gets the word out to more and more people, same thing with any presentations I've been forced to give, every single one of them being tied in.