Disadvantages:
- Sometimes a user may reject biometric systems as a whole. They can see it as being invaded of their privacy. Also biometric machines are not always entirely accurate as they are only available to scan clear fingerprints, which have been cleaned of from natural oils. Also voice recognition security systems are not always accurate either sometimes it has to unlock the device especially if you have a cold. Sometimes some scanners can also be fooled of a molded finger of an individual, which can be another reason as to why a user may opt out of using biometric scanners and in the worst case scenario, criminals tend try and cut off a person's finger.
- Even though CCTV systems let you monitor your house they can't actually do anything to stop and sort of robbery and if you're out and about then by the time you arrive at the scene the robber may be well long gone with the goods and you can't do anything about it.
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