Little Known Statute of Interest

I was doing some research on an issue this morning and came across this statute. Mississippi Code Ann. Sec. 13-1-13 (1972) provides that: "Any witness may be examined touching his interest in the cause or his conviction of any crime, and his answers may be contradicted, and his interest or his conviction of a crime established by other evidence. A witness shall not be excused from answering any material and relevant question, unless the answer would expose him to criminal prosecution or penalty."  From my reading of this statute, this pretty much makes discovery on anything regarding witness credibility fair game and subject to discovery particularly with the phrase by other evidence being added.