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This one is considered the the most reliable method. It is widely used in certain situations like criminal investigation, paternity testing. All human cells contain DNA. Most commonly blood or saliva is used for testing, but it works with hair, nail and other tissues as well.

The downside of this method is that it is very slow and quite expensive.

These days a DNA sample can be identified in roughly 30 minutes. Naturally, this fact rules out this kind of access control in an office building for example.

DNA based comparison differs from the other methods, because of its reverse principles. The cause of this inversion is that DNA samples are more than 98% identical, and because of this it does not search for similarity, but for dissimilarity and exclusive elements.

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