Idaho Statutes provides a strict formality of signature before two witnesses to be a legal organ donation.  The affixing of organ donor upon your driver’s license is just a method to identify to legal authority that you have previously executed an organ donor card.  A good family law attorney can advise you of the available options in your situation to become organ donors.  Remember that a general informational series is not a substitute for actual legal representation.
As part of its estate planning service, Meyers Law Office, PLLC., provides a free Statutory Living Will
and Durable Power of Attorney.