Nano technology methods Highly used for porous, non- porous and wet surfaces by using Nano technology method we can examine latent ingerprints on different surfaces if we take modern method like multi metal deposition method the advantage of multi metal deposition method is it can analyses the ingerprint donor is smoker or not, and multi metal deposition method have capable to analyze the ingerprint donor is drug addict or not, suppose if we take conventional method VMD it cannot analyses latent inger prints on plastic polymer if we take modern method.