Introduction The objective of this paper is to utilize the internet to solve crimes. The three types of methods that are proposed to be discussed are:  1. Fingerprints matching  2. DNA tests  3. Biometric tests include Iris recognition. Its main objective is to seek ways and means by which the devious and nefarious deeds of criminals are prevented and strong robust technology could help arrest the culprits and also exonerate innocents languishing in jails due to miscarriage of justice. Fingerprints matching Integrated Automated Fingerprint Identification System (IAFIS) is a Federal fingerprint and criminal record archiving system developed and maintained by the Federal Bureau of Investigation (FBI). This has tremendous potential for the electronic retrieval of fingerprints in real-time. The modus operandi of the IAFIS is as follows: The fingerprints are taken after arrest, processed locally, and then electronically transmitted to state or federal agencies for processing. “The fingerprints are then electronically forwarded through the CJIS Wide Area Network (WAN) to the FBI’s IAFIS for processing. Mailed ten-print fingerprint cards are converted to an electronic format for processing in the IAFIS environment.” (Criminal Ten Print Finger Print Identification Submission). Thus, the results of searches are made electronically and also have details of potential matching profiles and their equivalent fingerprints for similar and equivalent fingerprints for identification and association by the initiating agency. Thus it is seen that the IAFIS, formed in 1999, is a major institution which is responsible for the maintenance of the “largest biometric database in the world, containing the fingerprints and corresponding criminal history information for more than 55 million subjects in the Criminal Master File.” (Integrated Automated Fingerprint Identification System or IAFIS: What is it). DNA Testing To identify individuals, forensic scientists scan thirteen different DNA areas or characteristics. These differ from person to person, and often they use such information to create a DNA profile, pertaining to that individual. For instance, from the scene of a crime, forensic police officers and detectives may recover hair strands, a sample of saliva, footprints, or other vital evidence. With the help of this, they would create a DNA basis of the likely characteristic of the potential offender. When suspects are held, their DNA samples are taken, and electronically matched with that of the DNA samples recovered from the scene of the crime. It is very likely that the DNA samples of the likely suspect would match on maximum scores, though not fully. Hence, police may be able to narrow down the search, and even seek ways and means to extract confessions from the suspect, through the positive use of DNA testing. The world of crime-fighting has received a tremendous boost with the use of “Deoxyribonucleic acid, or DNA. DNA can be used to identify criminals with incredible accuracy when biological evidence exists. By the same token, DNA can be used to clear suspects and exonerate persons mistakenly accused or convicted of crimes. In all, DNA technology is increasingly vital to ensuring accuracy and fairness in the criminal justice system.” (Using DNA to Solve Crimes). Although DNA tests could not be said t