Ah but you see Vulcan, she put the word "recovering" in front of her "addict" title. She claims she was clean before and during most of her pregnancy, and that only towards the end (but before giving birth) did she give in to her addiction again. She also claims to have been clean since. Since no one was testing her before, and no one was testing her after, until the baby died and an autopsy was performed, we have only her word on when she started using again, and when she stopped.