Featured Research

from universities, journals, and other organizations

DNA Paternity Test Almost Fooled: Man Put Someone Else's Saliva In His Mouth

Date:
April 12, 2008
Source:
University of Granada
Summary:
Detection of a fraud attempt in sample taking for a DNA analysis is modifying forensic scientists' action protocol: It will be compulsory for the donor to wash his mouth out before a witness. The fraud attempt took place in a paternity test, when the donor mixed his own saliva with that of someone else's. Faced with the evidence, the suspect admitted that, shortly before the sample taking, he put someone else's saliva into his mouth from a little container.

Detection of a fraud attempt in sample taking for a DNA analysis is modifying forensic scientists' action protocol: It will be compulsory for the donor to wash his mouth out before a witness. The fraud attempt took place in a paternity test, when the donor mixed his own saliva with that of someone else's.

Researchers from all over the world have been carrying out paternity tests regularly. Samples are usually collected from mouth and saliva cells to carry out the DNA analysis.

The team of Dr José Antonio Lorente Acosta (director of the Laboratory of Genetic Identification of the University of Granada) carries out these forensic studies commissioned by the court in cases of paternity tests, for the identification of possible criminals or to carry out DNA databases (such as in the case of missing relatives).

The detection of a fraud attempts in a paternity test case in 2007 is changing the action protocol of forensic teams in similar cases. The team of Dr Lorente encountered a strange case: "the saliva analysis (epithelial cells from the interior of mouth) collected from a person undergoing a paternity test gave an incongruous result, a DNA which could not come from the man who had carried out the test."

The revision of the case revealed that they had followed the usual procedure: the suspect washed his mouth and after that they took the samples with a cotton swab. "After repeating the analysis, there was an only one possible conclusion: In the mouth of that man there was DNA from two different persons.".

After dismissing other possibilities, the question was: how was it possible? "We arranged to meet the person in question, we showed him the result and we explained him that we suspected that he had manipulated the samples which, as it was a trial in judicial investigation, could bring him serious consequences. Faced with the evidence, he admitted that, shortly before the sample taking, he put into his mouth some saliva he kept in a little container."

It was an attempt to evade the responsibility in a case of extramarital paternity demand, and “he admitted that, when he mixed his saliva with someone else’s, he attempted to "mislead" the experts in forensic genetics and, through them, the judge. After repeating the test it was revealed (with a probability of more than 99, 999998%) that he was the biological father in that case of judicial investigation.”

Consequences

The referred case gains a special importance as this is the first time it has been described that someone has mixed two types of saliva in order to alter a DNA test; manipulation attempts in blood samples had been described before (with transfusions antes before the sample taking, for example).

"We must highlight –points out Lorente- that the alteration of DNA tests is almost impossible without forensic experts realizing it, but this case aroused the interest of the scientific community after its publication in the journal of the American Academy of Forensic Sciences. The reason is obvious: It raises the need of adopting special measures to prevent experts’ error leading to crime or fraud --  or lack of punishment. From this publication, many protocols of saliva taking for forensic analysis (cases of paternity, crime suspects, and DNA databases) include the obligation for saliva donors to wash their mouth out with water before a witness, just before he places the swab in his mouth to collect saliva samples."

This case was studied by FBI experts (USA), interested in preventing possible manipulation attempts of the tests, and one of them, Dr Bruce Budowle, is co-author of the work.

Journal reference:  Intentional Mixed Buccal Cell Reference Sample in a Paternity Case. Journal of Forensic Sciences, 52:397-399. Year: 2007


Story Source:

The above story is based on materials provided by University of Granada. Note: Materials may be edited for content and length.


Cite This Page:

University of Granada. "DNA Paternity Test Almost Fooled: Man Put Someone Else's Saliva In His Mouth." ScienceDaily. ScienceDaily, 12 April 2008. <www.sciencedaily.com/releases/2008/04/080410131603.htm>.
University of Granada. (2008, April 12). DNA Paternity Test Almost Fooled: Man Put Someone Else's Saliva In His Mouth. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2008/04/080410131603.htm
University of Granada. "DNA Paternity Test Almost Fooled: Man Put Someone Else's Saliva In His Mouth." ScienceDaily. www.sciencedaily.com/releases/2008/04/080410131603.htm (accessed July 22, 2014).

Share This




More Matter & Energy News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Government Approves East Coast Oil Exploration

Government Approves East Coast Oil Exploration

AP (July 18, 2014) — The Obama administration approved the use of sonic cannons to discover deposits under the ocean floor by shooting sound waves 100 times louder than a jet engine through waters shared by endangered whales and turtles. (July 18) Video provided by AP
Powered by NewsLook.com
Sunken German U-Boat Clearly Visible For First Time

Sunken German U-Boat Clearly Visible For First Time

Newsy (July 18, 2014) — The wreckage of the German submarine U-166 has become clearly visible for the first time since it was discovered in 2001. Video provided by Newsy
Powered by NewsLook.com
Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Reuters - US Online Video (July 17, 2014) — President Barak Obama stopped by at a lunch counter in Delaware before making remarks about boosting the nation's infrastructure. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

TheStreet (July 16, 2014) — Oil Futures are bouncing back after tumbling below $100 a barrel for the first time since May yesterday. Jeff Grossman is the president of BRG Brokerage and trades at the NYMEX. Grossman tells TheStreet the Middle East is always a concern for oil traders. Oil prices were pushed down in recent weeks on Libya increasing its production. Supply disruptions in Iraq fading also contributed to prices falling. News from China's economic front showing a growth for the second quarter also calmed fears on its slowdown. Jeff Grossman talks to TheStreet's Susannah Lee on this and more on the Energy Department's Energy Information Administration (EIA) report. Video provided by TheStreet
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins