18 Legal Medical Marijuana States and DC

The use and cultivation of Medical Marijuana is a higher possession rate, working it's way through 18 States and yes DC. 

Residency Requirement - 16 of the 18 states require proof of residency to be considered a qualifying patient for medical marijuana use. Only Oregon has announced that it will accept out-of-state applications. It is unknown if Delaware will accept applications from non-state residents once the program is established.

Several states with legal medical marijuana have received letters from their respective United States Attorney's offices explaining that marijuana is a Schedule I substance and that the federal government considers growing, distribution, or possession of marijuana to be a federal crime regardless of the state laws. These letters have caused some states to delay or alter implementation of their medical marijuana programs.

Update Dec 6th 2012

The law made it legal for those over 21 to possess and use up to an ounce (28 grams) of marijuana. A number of US states have already legalized pot for medicinal purposes, but Washington is the first allowing it purely for fun.
This is going to bring a prospect of 25 percent tax revenues levied on legally sold marijuana, money which previously stayed strictly in the underground economy. Also I understand their going to make legal Marijuana cheaper even with the state tax then what a drug dealer can sell it for. Wow, are we actually moving to a new economy that not only benefits medical use but to create a new breed? "Ganja-preneurs."

"But the police department believes that, under state law, you may responsibly get baked, order some pizzas and enjoy a Lord of the Rings marathon in the privacy of your own home, if you want to."

A Guide to Legal Marijuana Use In Seattle

18 States

Well, this is serenity a battle going on between the States and Federal government. Some 8 petition were signed to legalize Marijuana and this is the response.

What We Have to Say About Legalizing Marijuana. When the President took office, he directed all of his policymakers to develop policies based on science and research, not ideology or politics. So our concern about marijuana is based on what the science tells us about the drug's effects. (full article)

Much research is going on over seas were Cannabis and Cannabinoid Research has shown that cannabis extract proved twice as effective as a placebo. It also helped with pain, spasms, and sleep.

RESULTS: Just under 30 percent of subjects treated with cannabis extract experienced relief from muscle stiffness, making their success rate almost double that of the placebo group. Pain, spasms, and sleep quality were also improved in the treatment group to about the same extent. At the end of the twelve weeks only one in four patients were taking the maximum daily dose of 25 mg of cannabis. None of the side effects experienced by those in the treatment group were particularly severe. Most occurred during the first two weeks of the trial (when they were allowed to increase their dosage) and were therefore probably attributable to the rapid dose escalation.

CONCLUSION: Cannabis extract was confirmed as a viable treatment option, and an effective form of pain relief, for those experiencing muscle problems associated with MS.

Cannabis And Cannabinoid Research

Cannabis Science Inc.: Works with World Authorities on phytocannabinoid science targeting critical illnesses. Adhering to scientific methodologies to develop, produce, and commercialize phytocannabinoid based pharmaceutical products.

Europe is pushing this and for good reason, we need a new economy, the boost on pharmaceutical industries in the US and around the world. According to president and CEO Dr. Robert Melamede, CSI "What we're seeing is a global revolution that's going to end this insane prohibition against cannabis in this country. Who in their right mind would outlaw an anti-aging drug that kills cancer cells and uses the same activity that's found in mother's milk?"

CSI

Update Apr 16, 2015
23 Legal Medical Marijuana States and DC

Well until this gets hashed out, this just might be the next Gold Rush.

Some comments on this:

I live in Colombia and I have seen how violent and hard has been the war against the drugs. Thousands of deaths, millions expended and people here only have to go to the next bloc park and buy some pot for like 50 cents USD.
Now I read the news and your PD are writing funny blogs about how you can use it now. That my friends is what I call social evolution. I hope someday my country learn this from you and here we all could live in peace... and listening to some Bob Marley.
Peace. Jools
JoolsGuitar

Feel free to relocate to a state where it's illegal and still priced according to your liking.
jokergd

That just means the people on the streets can bump their prices up and make even more.
Rad Roachs

Not trying to be a downer just saying not EVERYONE, likes weed and regardless if you read the rules, it can't be used in public.
ryokoshii

 isuxkballz