Drug testing positive for fentanyl after 1 month and a half

Hey guys I’m random drug testing for DCS (child protective services) at Averhealth 2 times a week and also random drug testing at CMS (my MAT clinic methadone) 2 times a month my drug of choice was fentanyl and my last drug use was on December 1 2024 it is now January 16 2025 and I am still testing positive for fentanyl at CMS but at Averhealth for DCS I have been testing negative for fentanyl ever since December 19 2024 so my question is how can I be testing positive for fentanyl at one place and also be testing Negative for fentanyl at the other place? I have only taken 3 tests so far at CMS and they have all been positive for fentanyl but at Averhealth with dcs I have taken 8 tests so far and have all been negative I am so confused on how this is possible?