Question

How are fingerprints discovered at crime scenes?

Answer 1

they use a light generator scan to find finger prints.

Step-by-step explanation:

they used them on my criminal case file.

Answer 2

Since biological fluids, such as semen, saliva, urine and others fluoresce, and any of these fluids could find their way onto the fingertips that leave fingerprints at crime scenes, an 'invisible' or latent fingerprint may be revealed by fluorescence