Medical marijuana is new in many states, and in Texas, medical marijuana is still part of a drug movement for reform. For some individuals, it can be purchased to treat a number of medical conditions, but the laws are still confusing and new. The drug itself is used to treat people who have long-term symptoms and terminal illnesses. It can be used to help with epilepsy, cancer and other diseases.
Generally speaking, medical marijuana is the same as any other kind of marijuana, except for the fact that it is used for medical purposes. It still is recognized federally as a Schedule I drug, which means it has the potential to be abused and is not accepted for any medical use within the United States. It does not have acceptance even when used under medical supervision.
So, if this is the case, how are people getting medical marijuana? Some states have special laws providing access to the drug, because people there have determined that the drug's benefits outweigh the harm it could cause. Some groups believe the drug is a valuable medication, and some politicians believe it's control through government agencies is the best way to combat illegal drug use.
Because medical marijuana is not widely accepted, it's possible to have a medical marijuana card in one state and have the drug in your possession with no problems and be carrying an illicit substance in another. There are limits to how much of the drug you can possess, and having more can still land you in trouble with the law.
Source: FindLaw, "Medical Marijuana: An Overview," accessed May 27, 2016