Spectroscopy has proven to be a non-destructive method for successfully analyzing different bodily fluids as well as other types of forensic materials such as drugs or fingerprints. This allows the evidence to be tested while still preserving it. It also utilizes portable instrumentation making it easy to do the testing right at the location of a crime without even removing the evidence from the scene. Another advantage is that a specimen does not require any preparation to be evaluated by a spectrophotometer. In order to identify samples, such as type of body fluid, the spectrophotometer compares samples to data within a spectral library.