Frequently asked questions Is a Maryland Medical Marijuana Card valid in other states? Some states accept out-of-state Medical Marijuana Cards. This is called reciprocity. The following states accept out-of-state medical cannabis cards: – Alaska ^ – Arkansas * – California ^ – Colorado ^ – Hawaii * – Maine – Massachusetts – Michigan – Nevada – Oklahoma * – Oregon ^ – Rhode Island – Washington ^ – Washington D.C. States marked with * require visitors to complete a visiting patient application for the duration of their stay. States marked with ^ have adult use programs but do not accept out of state cards.