Withholding information from patients during an informed consent process is ethically unacceptable. Patients may restrict the amount of information they wish to receive or designate someone else to receive the information for them.
AMA J Ethics. 2015;17(3):209-214. doi:
10.1001/journalofethics.2015.17.3.ecas2-1503.
Patients who use drugs intravenously may be at high risk for relapse, but their situation is no more futile than that of persons with diabetes and coronary artery disease who smoke and frequent all-you-can-eat buffets.