You may want to look up fetal alcohol syndrome as well. If she did meth while pregnant (which is not a good thing for a developing fetus) she most likely did not turn down alcohol by saying, "No, I'm pregnant and don't want to hurt the baby." Drug abuse to an unborn fetus can cause brain damage that can't be seen in any x-ray. It may be hard to know where Reactive Attachment Disorder (RAD) starts and drug effects come in.
And I may also add that you don't know for a fact that he isn't harming animals. Probably not in front of you he's not and maybe he isn't. Perhaps he is nice to your dog...at least in front of you. But my Reactive Attachment Disorder (RAD) son did it to neighborhood animals until he finally cracked and killed our dog, claiming he just found the dog dead. Reactive Attachment Disorder (RAD) kids are tricky and know how to behave...in front of adults.
I'd say there is an equal chance though that the problems are from prenatal drug abuse as well as early neglect or even abuse that husband doesn't know happened while he was at work. We adopted a child who had severe Reactive Attachment Disorder (RAD), but we didn't know it for three years nor did any of his old foster parents of his social workers or even a psychiatrist. He always had such a good face for adults. Reactive Attachment Disorder (RAD) kids can be extremely dangerous to other kids and I wonder if he ever hurt his little brother or acted out sexually on him.
Reactive Attachment Disorder (RAD) (the full spectrum of it) is a lot like adult psychopathy. Our Reactive Attachment Disorder (RAD) son was escorted out the door when we found out he was not only killing animals but sexually abusing our two younger kids. We've never seen him again. We never want to. It wouldn't shock me if I see him on TV as a murderer.