Sentence:  You may think we did n't need Nancy and Jean , but you always get what you can when you can , and we had no guarantee that a <WSD>fingerprint</WSD> record on them could n't be useful before we were through with this case . 
Meaning of the word marked with <WSD> tags:  a print made by an impression of the ridges in the skin of a finger; often used for biometric identification in criminal investigations