How reliable are the results of DNA testing?

Answer 1

Answer Generally, DNA is 99.9% reliable. In practical terms, in a city of 1 million people, if a person commits a crime and is identified using DNA, only 1000 other people could have committed the crime. Answer Everyone accept identical twins would have different DNA. There is also a RARE Genetic disorder that causes a person to have two different sets of DNA. It is called Chimaerism.

Answer Despite popular belief, DNA evidence is not as accurate as people might assume. The 99.9% people often cite is actually just an estimate and no one is actually sure how accurate it might be. While every person's DNA is different, a DNA profile, the bit used as evidence, is only a small sliver of a person's entire DNA, and even siblings may share a very similar DNA profile. In 2001 Kathryn Troyer ran a test of Arizona's DNA database of felons and discovered two felons with DNA profiles where 9 of 13 markers were identical, despite the fact that one was white and one was black, and later discovered dozens of other similar matches, yet the FBI estimates the odds of some one sharing those genetic markers to be 1 in 113 billion. The fact that only 13 markers are used out of the entire DNA strain should bring into question the validity of DNA evidence.

Answer: DNA evidence can be incredibly accurate, but it depends entirely on the quality of DNA recovered. If the DNA is of a good quality then it is capable of identifying enough markers to reduce the probability to such a number that there will not be another individual with the same genetic markers recovered. If enough markers are identified to bring the probability to 1 in 113 billion then there is no need to identify any more markers as this means for every 113 billion people only 1 person will have that set of markers, and as the population is only 7 billion than the chance of another individual having the same set of markers is as close to impossible as you can get.

Answer 2

No laboratory test is 100 percent accurate, but DNA tests are pretty close (a commonly cited figure is 99.5%, meaning there's a 1 in 200 chance that a given individual will test as a positive match for a DNA sample from someone else).

Answer 3

No, DNA fingerprinting is not considered 100 percent accurate. It is officially considered 99.99 percent accurate even though it is slightly more in actuality.

Answer 4

There are many different accuracy percents of the DNA paternity testing. If the child is indeed yours the percentage will most likely be 99.99 since nothing is one hundred percent in science.

Answer 5

DNA testing is entirely accurate, although there is 0.001% chance that a DNA match is matched by pure chance.

Answer 6

Some triplets received dna tests with some interesting results.