Speaking for California, but you technically consent to blood draws when you get your license Cvc 23612

I don’t think it’s ever been forced though for a simple DWI, and I’d find it hard to believe a random nurse/phlebotomist would be down with a forced blood draw.

You can probably refuse everything but the other circumstances of being impaired likely won’t help ya and if it’s gone that far you’re probably going to jail anyway