false negatives in a sentence

Examples

1. The formaldehyde used as a preservative produces false negatives in both reactions.
2. So, what processes might cope with false negatives?
3. Investigators said the tests often produced false negative results.
4. False negatives are not allowed : a valid proof must always be accepted.
5. The tuberculin skin test fails due to the high numbers of false negatives.
6. The false negatives rate is 20-30 %.
7. Test against false " positives " as well as false negatives.
8. This may have resulted in less acid reflux and a false negative test.
9. Thus the DD algorithm can only create false negatives.
10. Grammars deduced from examples have the problems of false positives and false negatives.