I would be worried about the child of an alcohol addict, let alone an opioid addict.
But this is just an assumption; I don't actually know of any statistics correlating addiction with neglect.
It is not like republicans would care what happens with kids themselves. If they get harmed by foster system (which they will) that will just allow them to cut fundings to foster system.
The other thing of note is that that same group of people are more interested in fostering and adopting and that it’s also a way to indoctrinate the children of “people we don’t like.”
Although she dropped her opposition years later after his mother improved, I still wouldn't hold his mother out as an example of a functional addict.
(Also when he was a child, didn't his mother send him to live with his grandparents because she was too dysfunctional to care for him? Or did I get that wrong?)
But it isn’t reasonable, partly because there are so many opioid addicts that don’t show up in measures of homelessness etc. These laws would involve putting 10,000 kids into foster care so that maybe 10 deaths are prevented - and this would overwhelm the foster system entirely, tripling the size in an instant, so you’d almost certainly see ten children die because they were put into the system.
[0] As an example of the level of thought and knowledge going into these attempts, one legislator wrote a bill that said any opioid use meant CPS should remove your child. Don’t know if they didn’t know it could be a prescribed medication or what.