One possibility: a wife cannot testify against her husband and vice versa.
Not true. They can refuse to testify, if they claim spousal privilege, but they're not forced to do so.
Yeah, FR is incredibly cool in that regard. We have experts from every walk of life posting here. Doctors, lawyers, Indian Chiefs, you name it.
A misstatement here is almost always corrected before long. I've learned a ton of information from this site. It's not all opinion or silly chat posts. There is some real substance if you're willing to look.