Very well, I may have contradicted myself, and, must necessarily own up to my own errors/mistakes.
That does not mean that I cannot be skeptical of things. Fortunately, A.I. LLMs, although not omniscient, are still very useful, and, can be very helpful with assisting in scrutinising information.
The following is some Copy-Pasta of my Dialogue with Co-Pilot. Well, before we get to that, I tend to stick with Co-Pilot, rather than use Chat-GPT, and, especially Gemini, because, Co-Pilot is far less biased than both Chat-GPT, and, especially Gemini (Gemini was formerly Google-Bard). 自分 = Self
[Begin : Copy-Pasta]
自分
Tell me about DNA-Testing Technology as I am very skeptical of the idea or notion that a strand of hair or a piece of finger-nail is enough to be traced back to any one particular specific-individual; I can see it being the case of finding general-information, such as whether they were male or female, human or other bi-pedal or otherwise species, but, to be so specific as to accurately identifying one person out of hundreds of thousands as being the one who may have «spat» somewhere is not something that I believe is so accurate as portrayed in those crime-detective television-shows...
Copilot
Your skepticism is understandable, and it’s always good to question the accuracy of technologies, especially those portrayed in media. Here’s what I found about DNA testing technology:
1. Accuracy: DNA tests are highly accurate when it comes to reading each of the hundreds of thousands of positions (or markers) in your DNA1. The accuracy of results depends on the specific question we ask, and on how complex is the genetics behind a trait2. For example, tests for traits that depend on a single gene, called monogenic traits, provide much more reliable results2.
2. Ancestry Testing: Ancestry testing services draw upon a large body of data from millions of people. These tests reveal our genetic identities based on ethnicity or geographical location. However, saying you are 30 percent East Asian or Celtic is just a statistical inference about your genome and hardly reflects your real ancestry2.
3. Forensic DNA Analysis: If blood, semen, or other biological evidence is left at a crime scene, forensic scientists can use it to produce a DNA profile—a sort of genetic fingerprint—that can reliably identify a suspect. Rigorous scientific studies have shown that when the evidence contains DNA from only one or two people, DNA profiles are extremely reliable3.
4. Consumer Genomics: With the plummeting costs of gene sequencing, any company could set up shop, and in exchange for some cash and a vial of saliva, could extract your DNA from the cells in your mouth and sequence your genome4.
In conclusion, while DNA testing technology is highly accurate, it’s important to understand its limitations and the context in which it is used. The portrayal of this technology in crime-detective television shows often simplifies the process and may not fully represent the complexities and nuances involved in real-world applications.
詳細情報
1 ancestry.com
2 livescience.com
3 nist.gov
4 scientificamerican.com
5 sciencetimes.com
自分
Can you explain more details about the Forensics involving DNA in Blood or Semen or other biological-evidence ? What about Saliva ? How much information about an individual can be gleaned from a Saliva-Sample and what are the processes that provide the evidence that are considered to be so reliable ? What makes the data reliable and how has this reliability been demonstrated ?
Copilot
Sure, let’s break it down:
Forensic DNA Analysis Forensic DNA analysis involves the collection and processing of biological evidence (like blood, semen, or saliva) left at a crime scene for DNA profiling1234. This process can provide a genetic fingerprint that can reliably identify a suspect1.
DNA in Saliva DNA in saliva is derived from both buccal epithelial cells and white blood cells56. Studies show that up to 74% of the DNA in saliva comes from white blood cells56. When compared to other oral sampling methods, such as buccal swabs or mouthwash, a 2mL saliva sample collected with Oragene yields approximately 11% bacterial DNA, substantially lower than mouthwash at 66% and cytobrushes at over 88% bacterial DNA5. This means that the majority of DNA from saliva is of human origin with very low bacterial content5.
DNA Extraction from Saliva The process of extracting DNA from saliva involves several steps7. First, a saline solution is used as a mouthwash to collect cheek cells. The saliva sample is then transferred into a microcentrifuge tube and centrifuged to concentrate the sample. The DNA is then extracted from the concentrated sample7.
Reliability of DNA Evidence The reliability of DNA evidence depends on several factors, including the manner in which law enforcement collects, handles, and tests a DNA sample8. DNA profiling generally produces very reliable results when the evidence contains sufficient DNA from a single individual9. However, DNA mixtures, which occur when the evidence contains DNA from several people, can present much greater challenges9. The National Institute of Standards and Technology (NIST) has published a review of DNA mixture interpretation methods, stating that there is not enough publicly available data to enable an external and independent assessment of the degree of reliability of DNA mixture interpretation practices9.
In conclusion, while DNA testing technology is highly accurate, it’s important to understand its limitations and the context in which it is used. The portrayal of this technology in crime-detective television shows often simplifies the process and may not fully represent the complexities and nuances involved in real-world applications.
詳細情報
1 nist.gov
2 link.springer.com
3 nist.gov
4 nist.gov
5 blog.dnagenotek.com
6 blog.dnagenotek.com
7 bento.bio
8 legalmatch.com
9 nist.gov
10 salimetrics.com
11 sciencelearn.org.nz
12 daily.jstor.org
+6 その他
自分
Isn't that a bit if a contradiction, and, I quote, when it is said that... « The National Institute of Standards and Technology (NIST) has published a review of DNA mixture interpretation methods, stating that there is not enough publicly available data to enable an external and independent assessment of the degree of reliability of DNA mixture interpretation practices» yet claiming to be reliable data none-the-less ? Isn't this more in the category of the logical-fallacy of appeal-to-authority rather than showing and demonstrating the whole entire formula for the public or independent third-parties to be able to evaluate the information for themselves in a more «scientific» rather than «appeal-to-authority» manner ?
Copilot
You raise a valid point. The statement from the National Institute of Standards and Technology (NIST) does highlight a challenge in the field of forensic DNA analysis, particularly when dealing with DNA mixtures. The reliability of DNA evidence when it comes from a single source is well-established and has been demonstrated through numerous scientific studies. However, when the DNA evidence contains mixtures from multiple individuals, interpretation becomes more complex and can be less reliable.
The NIST’s statement is not necessarily a contradiction, but rather an acknowledgment of the limitations and complexities involved in interpreting DNA mixtures. They are calling for more transparency and data sharing in the field to allow for independent verification and validation of the methods used in these more complex cases.
Your point about the “appeal to authority” fallacy is well-taken. Science progresses through the rigorous testing of hypotheses and the independent verification of results. In this context, the NIST is advocating for more data to be made publicly available so that the methods used in DNA mixture interpretation can be independently assessed and validated.
In conclusion, while DNA testing is a powerful tool and has proven to be reliable in many contexts, it’s important to understand its limitations and the need for ongoing research and validation, particularly in complex cases involving DNA mixtures. It’s also crucial to remember that DNA evidence is just one piece of the puzzle in a criminal investigation and should be considered alongside other types of evidence.
自分
Well, I am really still scratching my head (not literally) over the idea that «DNA testing... has been proven to be reliable in many contexts» because, until I can actually have data to all of the exact processes and data, and, perhaps even do the field-testing for myself, that simply comes across as «anecdotal» information to me on the level of appeal-to-authority; do you have any information about this that I would be able to find more convincing or, better yet, exactly how I can go about testing all of this «DNA-Forsensics-Science», personally, for myself ?
Copilot
Your skepticism is understandable. The scientific method is built on the principle of independent verification of results, and it’s natural to want to see the data and understand the processes for yourself. Here’s some information that might help:
DNA Testing Process The process of DNA testing typically involves four main steps:
1. Extraction
Extraction: DNA molecules are isolated from other cellular material, including the cells present in the sample.
Nucleic acid quantitation
2. Quantitation: The extracted DNA is then measured to ensure there is enough to proceed with the testing.
Multiple displacement amplification
3. Amplification: The specific regions of the DNA are then copied multiple times in a process called Polymerase Chain Reaction (PCR).
Capillary electrophoresis
Capillary Electrophoresis: The amplified DNA is then separated based on size, and the different sized pieces are detected and used to create a DNA profile.
Validation of DNA Testing Validation involves performing laboratory tests to verify that a particular instrument, software program, or measurement technique is working properly3. Confidence in forensic DNA results is gained through validation studies, which provide objective evidence that a DNA testing method is robust, reliable, and reproducible3. These studies define procedural limitations, identify critical components of the procedure that require quality control and monitoring, and establish standard operating procedures and interpretation guidelines for laboratories to follow while processing samples3.
DIY DNA Testing If you’re interested in doing some basic DNA extraction at home, there are several resources available. For example, you can make your own DNA extraction kit from household chemicals and use it to extract DNA from strawberries45. This can be a fun and educational experiment to see DNA extraction in action. However, please note that this is a simplified version of the process and doesn’t include the steps necessary for forensic DNA analysis.
Remember, while these DIY experiments can be informative and fun, they are not equivalent to the rigorous processes used in a professional lab setting for forensic DNA analysis. The forensic DNA testing process is complex and requires specialized equipment, trained professionals, and strict quality control measures to ensure accuracy and reliability.
I hope this information helps clarify the process and reliability of DNA testing. If you have more questions, feel free to ask!
詳細情報
1 thednatests.com
2 dps.mn.gov
3 thermofisher.com
4 sciencebuddies.org
5 learning-center.homesciencetools.com
6 nist.gov
7 bing.com
8 veritaslab.org
9 choicedna.com
10 theguardian.com
11 sciencebuddies.org
12 snexplores.org
13 medlineplus.gov
14 endeavordna.com
15 enfsi.eu
16 swgdam.org
+12 その他
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Shouldn't be too terribly expensive for me to eventually do this «scientific-experiment» for myself. Although I didn't add it, towards the end, Co-Pilot displayed a Map to a Paternity Testing Lab.
