Don't know, but I worked with a doc that was filling in for our local OB while said OB was on vacation (only 1 OB delivering at this hospital) and he would send home anyone ruptured (non GBS+), but not in active labor with instructions to return in 24 hours if she hadn't entered active labor.
He also gave the GBS+ moms the option of 1 dose abx IV then send home on PO or to stay.
Great guy, wish I could have cloned him!!