Latent Prints  Invisible prints  Produced due to oils from skin  Circumstantial, Physical, associative individual evidence  Need special lighting or chemical processing to view  Can be lifted

Best surface for the formation of a latent prints: HHard and nonporous surface GGlass PPlastic FFormica SSmooth metal FFinished wood

Chemically Detecting Finger prints Cyanoacrylate (super glue), bind to amino acids and forms a white print, uses fuming chamber Ninhydrin (triketohydrindenehydrate), dip or spray, takes several hours to develop, forms a blue/purple print, heating speeds process Silvernitrate, reacts with NaCl in print to form a blackish print when exposed to light

Other Prints  Patent Prints: prints formed from a substance on the hands like blood, paint,ink etc, These prints are visible.  Plastic Prints: prints made in a soft substance like clay, soap, etc. These prints are 3D.

Points of Minutiae:  Crossover  Core  Bifurcation  Ridge ending  Island  Delta  Pore  enclosure

Name the type of points of minutiae:

Fingerprints…. Why are they useful in Forensics?  All individuals have different prints  Each individual has 10 different prints  Prints remain the same through out lifetime  Prints can be classified into 9 basic types  Points of minutia can be identified  AFIS has been established