Go to this site, http://www.sfr.psu.edu/PDFs/HicksThesis.pdf it is way to long to post here. But, it is very clear by the terms of the legislation pointed out here, medical marijuana is a cash crop worth huge money.

When any LEO takes your Medicine, he/she can be held responsible for up to 3 times it's value depending on which state you live in and the language of the marijuana laws.