I am so sorry you are going through this. Sweetie, I don't think you need a hair test, if you think he is using he is probably using. And if he is using, your daughter continues to be in danger if in his care.
Can you find someone to watch your child when you are not there? Family or friends maybe?
Only you can decide how you want to live your life, the house doesn't really matter if it means living with active addiction.
I'm glad you came back and hope you find some comfort here.
Hugs