OUD with at least one UDS positive for buprenorphine or methadone (n=16) and OUD with UDS positive for only illicit opioids (n=9) did not significantly differ in functional connectivity within any of the 4 networks (p greater than 0.179). The regression of functional connectivity on time since last opioid use was not significant for any of the 4 networks (p greater than 0.313).