DH drinks a few nights a week and smokes pot daily. This is the very reason I'm considering leaving him. If I cite these reasons, would I be granted full physical custody and he visitation rights (I don't think he'd need supervision, he's just not a good day-in-day-out father)? Is there more to it than that? Would I have to prove it? Could he bs awarded shared custody (sorry, don't know the terminology). We're in PA by the way. TIA!!

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Re: TTM About Custody
You will need to prove that he does in fact do drugs. Drinking can be hard to prove because it is not illegal to drink. Take a picture of him smoking or paraphernalia. You can also request a drug test but you need to make sure you are clean as well.
I am in PA as well.
My lawyer told me it requires more than just pictures and saying the other person has a problem. She said the pictures could be old and it doesn't actually prove its theirs. She said a person can't just ask for a drug test because they think the others have a problem. She said there has to be arrests, DUIs, problems holding a job, etc.
50/50 Legal Custody is pretty standard, that's when you both get a say in medical, school, religion or any other big decisions. You could get Primary Physical Custody with your DH getting Partial Physical Custody during visitation.
"There comes a time in life, when you walk away from all the drama and people who create it. You surround yourself with people who make you laugh, forget the bad, and focus on the good. So love the people who treat you right, pray for the ones who don't. Life is too short to be anything but happy. Falling down is a part of life, getting back up is living."
I just lol'd at this. I'm sorry you're going through all this, but glad you are sticking up for yourself and LO. I'm still here if you need to vent!
This. And document ANY and ALL record of his alcohol abuse and smoking pot. Don't get too into details but things like: "STBXH had 5 beers in two hours and then drove his car". Or if he's been in any sort of legal trouble (DWIs, drunk in public, etc. get the public record of this). I'm a familiar face at the county clerk's office because I'm always getting the copy of the offense and the minutes from XH's criminal dealings.
Oh and if he's been violent as a result of this, document and take pictures. XH destroyed a doorjam and punched a hole in a wall so I took pictures of that.
Does he work in an idustry that might drug test?