Growing plants with a hydroponic system is becoming a lot more popular for a variety of reasons however it's important that you understand that there are a number of different items you will require to carry out this effectively. Because you are growing plants in a wholly unnatural environment, you will want to make sure that all the different elements are given to the plants. One of the most important elements of course is light.
Medical marijuana is now legal in fourteen US states and each one of these states has its own regime for distribution. If you want to start selling medical marijuana seeds in your own headshop or pharmacy you'll still need to abide by the state rules. It is still a federal offence to sell or buy marijuana in the US so make sure all the correct protocols are in place, and only sell to approved patients whatever state you happen to be in.