CALIFORNIA FAMILY LAW
...Marital Status
......Selected Evid. Issues: Marital Priv.
.........Not to Testify or be Called
............Authorities
3 Cards On This Topic:

Married person has privilege not to testify against spouse.

Marital privilege not to be called as witness against spouse.

Marital privilege applies regardless of whether or not there's a viable marital relationship. Only Legislature can add exception to express exceptions listed in EC 972.