Argument: DNA testing is fallible, and therefore should not be used as the basis of convictions

Although DNA detection might have advantages over fingerprint dusting, the test is nevertheless fallible. Environmental factors at the crime scene such as heat, sunlight, or bacteria can corrupt any genetic data. Any DNA evidence must be stored in sterile and temperature controlled conditions. Criminals have been suspected of contaminating samples by swapping saliva. There is room for human error or fraud in comparing samples taken from suspects with those removed from a crime scene. The accuracy of any genetic profile is dependent upon the number of genes examined. Where less than four or five genes can be investigated, the PCR technique serves only to exaggerate any defects or omissions in the sample. In 1995 an 18 month investigation was launched into allegations that the FBI Crime Lab was 'dry-labbing' or faking results of DNA comparisons1. Furthermore, in the United Kingdom, the company used by police to analyse its DNA samples was shown to have secretly kept the genetic samples and personal details of 'hundreds of thousands' of arrested people, stoking fears that, if lost, they could be planted as evidence2. The mere creation of a database cannot be the panacea for crime detection. 1 Johnston, D. (1997, April 16). Report criticizes scientific testing at F.B.I Crime Lab. Retrieved May 19, 2011, from New York Times: 2 Barnett, A. (2006, July 16). Police DNA database 'is spiralling out of control'. Retrieved May 18, 2011, from Guardian:

Candidate 1: "The use of a DNA fingerprint can scarcely be regarded as an affront to civil liberties and therefore requiring consent. Firstly, as a British Home Office spokeswoman noted, 'before a person's profile can be added to (the database), the person must have been arrested for a recordable offence. That is a significant threshold'2. Furthermore, the procedure for taking a sample of DNA is less invasive than that required for the removal of blood. The police already possess a vast volume of information relating to the citizenry. The National Crime Information Center Computer in the United States contains files relating to fifteen million Americans and receives approximately seven million queries each day2. The availability of a DNA fingerprint to the police should be seen in the context of the personal information that is already held by outside agencies. Insurance brokers commonly require an extensive medical history of their clients. Employers subject their employees to random urine tests for drug and alcohol consumption. If we are prepared to place our personal information in the private sector, why can we not trust it to the public authority of the police? The DNA will only be utilised in the detection of crime. In short, the innocent citizen should have nothing to fear. 1 Doward, J. (2009, August 9). 'Racist bias' blamed for disparity in police DNA database. Retrieved May 18, 2011, from The Observer: 2 National Crime Information Center. (2009). About Us. Retrieved May 19, 2011, from Federal Bureau of Investigation:"
Candidate 2: "A DNA database would lead to more convictions, particularly in cases of violent crime

Although overall levels of crime in England and Wales have decreased over the previous decade, the number of violent crimes against the person has markedly increased. These are the offences which raise most grave public concern and which are unlikely to leave conventional fingerprints. The National Commission on the Future of DNA Evidence estimates that thirty per cent of crime scenes contain the blood, semen, or saliva of the perpetrator1. DNA detection will be best equipped to identify the guilty. A full database ought to allow the use of DNA as an investigative tool where no suspect has yet been identified. Studies support this assertion; 'the overall detection rate for crimes of 23.5% rises to 38% where DNA is successfully recovered'2. Furthermore, in the United States, the number of reported rapes dropped to its lowest level in two decades due in large part to the use of DNA evidence3 1 Weathersbee, F. (1999, March 1). National Commission on the Future of DNA Evidence. Retrieved May 19, 2011, from National Institute of Justice: 2 Phillipson, G. (2009, November 19). The case for a complete DNA database. Retrieved May 18, 2011, from Guardian: 3 McGreal, C. (2009, October 8). Number of reported rapes in US drops to lowest level in two decades. Retrieved May 18, 2011, from Guardian:"
Candidate 3: "DNA evidence would reduce the risk of wrongful conviction

The increased use of DNA evidence will minimize the risk of future wrongful convictions. An FBI study indicates that since 1989 DNA evidence has excluded the primary candidate in 25% of sexual assault cases1. This not only saves valuable police time, but ensures suspects are not called in for unnecessary and stressful questioning. Moreover, forensically valuable DNA can be found on evidence that has existed for decades, and thus assist in reversing previous miscarriages of justice. There have been a number of recent, high-profile cases of death row inmates being released on the grounds of DNA evidence, unavailable when they were first convicted. A DNA database would not merely render wrong verdicts right, but prevent such verdicts ever being made. 1 U.S. Department of Justice. (1996, June). Convicted by Juries, Exonerated by Science. Retrieved May 19, 2011, from U.S. Department of Justice:"
Candidate 4: "DNA fingerprinting has considerable advantages over conventional means of forensic crime detection, advantages that render any slight fallibility irrelevant. Conventional fingerprints attach only to hard surfaces, can be smeared, or avoided by the use of gloves. Even a clear print requires a significant degree of interpretation by investigating officers. The standard technique of comparing fourteen points between the print taken at the crime scene and the print of the accused has been subject to severe criticism. The novel 'polymerase chain reaction' (PCR) amplification technique facilitates an accurate DNA profile from very small amounts of genetic data. The fingerprint can be constructed notwithstanding contamination from oil, water or acid in the crime scene environment. The innocent and the accused should appreciate a novel fingerprinting technique that is both objective and accurate. Lastly, fears of wrongful conviction are misguided, a 2002 study found only 'two cases worldwide'1. 1 Phillipson, G. (2009, November 19). The case for a complete DNA database. Retrieved May 18, 2011, from Guardian:"
Candidate 5: "A DNA database would reduce the time spent tracking down suspects

A DNA database is not intended to replace conventional criminal investigation. The database ought to identify the potential suspects, each of whom can then be investigated by more conventional means. During 2008/09 in the United Kingdom, 'almost 6 in 10 crime scene profiles loaded to the National DNA Database were matched to a subject profile'1. There is no possibility of escaping the provision of technical evidence before a court. Doctors, ballistics experts, forensic scientists are already a common feature of the large criminal trial. The jury system is actually a bastion against conviction on account of complicated scientific facts. The British jury is instructed to acquit a defendant where they find reasonable doubt. If the genetic data and associated evidence is insufficiently conclusive, or presented without sufficient clarity, the jury is obliged to find the defendant not guilty. 1 NDNAD. (2009). National DNA Database: Annual Report 2007-09. Retrieved May 19, 2011, from"
Candidate 6: "Retaining the DNA of unconvicted suspects is not unlawful, only retaining it indefinitely. New British proposals to meet the requirements of the European Court of Human Rights' judgment are to ensure the DNA of the unconvicted remains on the database for just 6 years. The law has to be laid down in a set manner rather than imprecise terms. Loopholes are often found but in the long run, they are what create a fair and just legal system. We cannot have loose laws, everything must turn on the wording. The ruling stated that the DNA of the innocent could not be saved indefinitely, so the British government is proposing that this DNA only be kept on the system for 6 years. They have done what the Court has asked them to do, to take away the permanency; a DNA database remains."

DNA fingerprinting has considerable advantages over conventional means of forensic crime detection, advantages that render any slight fallibility irrelevant. Conventional fingerprints attach only to hard surfaces, can be smeared, or avoided by the use of gloves. Even a clear print requires a significant degree of interpretation by investigating officers. The standard technique of comparing fourteen points between the print taken at the crime scene and the print of the accused has been subject to severe criticism. The novel 'polymerase chain reaction' (PCR) amplification technique facilitates an accurate DNA profile from very small amounts of genetic data. The fingerprint can be constructed notwithstanding contamination from oil, water or acid in the crime scene environment. The innocent and the accused should appreciate a novel fingerprinting technique that is both objective and accurate. Lastly, fears of wrongful conviction are misguided, a 2002 study found only 'two cases worldwide'1. 1 Phillipson, G. (2009, November 19). The case for a complete DNA database. Retrieved May 18, 2011, from Guardian:
