1. Fingerprint readers are fairly easy to fool. Researchers have used photocopies of fingerprints to fool the reader. We leave fingerprints all over the place, including on the fingerprint reader. Anyone one wanting to gain access could lift off the fingerprint and make a copy to fool the reader.
2. False positives. If the software is not sufficiently sophisticated, the system could give access to someone who should not have access.
3. False negatives. The reader may not recognize a valid user as having permission to gain access. This could be a result of a dirty scanning surface or some changes in the user's finger that make it impossible for the software to make a match. For instance, the reader may not recognize a user's finger that has a cut or a burn.
Biometric pattern recognition software is getting more sophisticating making false positives and negatives less likely. However, the problem of fooling the reader is a serious one. You should never use a fingerprint reader as the primary method of securing access to sensitive information or physical areas.
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