The one stipulation is that you have to have a condition outlined within the Rhode Island law. For example, if you have a card in California for insomnia that is technically not accepted in Rhode Island. Now, one's recommendation (at least the card) does not have the reasons for your MMJ recommendation...just the "permission" to use the controlled substance. Were you to actually get arrested and go to court, the card would not be a justifiable defense.
It is too early to go through the law and copy/paste, sorry. Perhaps another brother or sister here has access later in the day, or you can go to the Rhode Island Department of Health website and check out the details of the legislation.
Good luck to you, sis!
CD
P.S. This is why RI should be the first state to fully legalize cannabis!