Marc has been using cocaine for nearly ten years and is interested in seeking treatment. Dr. Johnson is leading a clinical trial on a pharmacological treatment for cocaine addiction.
After receiving details about the study and having all of his questions answered, Marc decides to think about it for a few days and talk it over with some friends and family members. He comes back later that week, asks Dr. Johnson some additional questions, and after hearing the responses signs and dates his consent to participate in the study, and Dr. Johnson proceeds with enrollment. Did Dr. Johnson obtain the necessary informed consent?