NSA phone spying didn't stop terrorist

[jim bell]

https://www.quora.com/q/techinsider/The-NSA-phone-spying-program-exposed-by-Edward-Snowden-didnt-stop-a-single-terrorist-attack-federal-judge-finds?ch=99&share=6c3ad8ea&srid=9CvSA
Jim Bell's comment:
However, I wonder if that this phone recording was ever used to backtrack to 
get other evidence.