Using Fast fingerprints for fingerprint scanning has many advantages. A potential drawback of using this new technology is that it could result in errors in the reproduction of fingerprints, which is one of the drawbacks of using this new technology. Still, there are also disadvantages, like the scanner may not be as accurate as other heat map methods. Fingerprint scanning doesn't work on wet fingers or if you have skin conditions like eczema or psoriasis. It is a rare medical condition, dermatoglyphic, characterized by the absence of fingerprints on the skin.