Opt-in or Opt-out Option for Research Contact

Do your healthcare systems have an opt-in or opt-out option for research contact? For example, at our institution when a patient consents to treatment, they can also opt-in to be contacted for research. But I know some institutions have a policy where once you consent to treatment, you also consent to being contacted about eligible research studies (have to opt-out of being contacted). I am trying to get a sense of the landscape.