Dextromethorphan Abuse

Hi. I live in an Oxford House and I suspect one of the members of abusing dextromethorphan. I'm calling a house meeting to get a test sample. Our house uses Redwood Toxicology services. I know they text for DXM, but am not sure if I need to specifically request the test or if it's automatic. Does anyone know?
You will need to request that test be done specifically for dxm. I've dealt with military drug testing and it's not tested for in the standard screenings. I do believe it will be its own test. Hope this helps.