did johnny cash ever record the song i fought the law ???

Interesting question. For some reason, as I read your question, I
heard in my mind, the words in his voice:

I fought the law and the law won.

Not that that guarantees it is right. Good luck.

http://en.wikipedia.org/wiki/I_Fought_the_Law
 says a number of people including Johnny Cash either sang the song in
concert or recorded it.

Sorry to bustin on the researchers who might get money for this.