I am not a lawyer, but I am fairly certain that that isn't true (if you're not driving).
Many states require that you identify yourself (presumably full name and DOB at a minimum) to an officer upon request, but I don't think that means you have to carry the physical card, just provide your identity (which can be done verbally).
Many states require that you identify yourself (presumably full name and DOB at a minimum) to an officer upon request, but I don't think that means you have to carry the physical card, just provide your identity (which can be done verbally).