Frequently asked questions Is a Colorado 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 ^ Puerto Rico 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.