Feasibility and Acceptability of Oxygen Saturation Monitoring Using Masimo SafetyNet Alert (MSNA) in a Supportive Housing Program

Inclusion Criteria for Client Participants: * Participants who are18 years of age or greater * Participants housed within a supportive housing program who intend to inject opioids * Participants who have given verbal informed consent to participate in the study Inclusion Criteria for Staff Participants: * Participant is research staff and/or Rita Thompson Residence staff * Participant is willing to give implied consent by reading and completing the staff survey Exclusion Criteria for Client Participants: * Participants deemed not suitable for the study at the discretion of the principal investigator, research staff or housing program nurses/staff * Participants with skin abnormalities at the planned application sites that may interfere with sensor application, per directions-for-use (DFU) or trans-illumination of the site, such as psoriasis, eczema, angioma, burns, scar tissue, substantial skin breakdown, nail polish, acrylic nails, infections, or other abnormalities that may interfere with MSNA functioning * Participants with known allergic reactions to foam/rubber products and/or adhesive tape Exclusion Criteria for Staff Participants: -None