EXPIRATION DATES EXTENDED: If you are a Medical Cannabis Patient, Caregiver or Authorized Purchaser and your ID Card from Rhode Island or any other state expired on or after March 1, 2020, please be advised that state officials have extended the expiration date through June 30, 2020 and the cards can be used through that date. The Slater Center continues to accept ALL new patients – from RI and out of state.