Why would a DNA test be inconclusive?

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Tags

1. #paternity
2. #testing
3. #reached
4. #mother
5. #yield
6. #accredited
7. #adding
8. #result
9. #samples
10. #under
11. #above
12. #collected
13. #biological
14. #results
15. #conclusive
16. #inconclusive
17. #considered
18. #enough
19. #laboratories
20. #without
21. #answer
22. #cannot