Koh Tao Murders: No DNA match says Dr. Pornthip

Koh Tao Murders: No DNA match says Dr. Pornthip

DNA on alleged Koh Tao murder weapon, a garden hoe, doesn't match DNA of Burmese men on trial for murder, says celebrity forensic scientist Dr. Pornthip.

The bodies of the murder victims in body bags at the crime scene on Koh Tao.


Koh Tao Murders: No DNA match says Dr. Pornthip

Dr. Pornthip, head of the Central Institute of Forensic Science under the Ministry of Justice, provided testimony in the Koh Tao murder trial today, that DNA taken from the alleged murder weapon, a garden hoe, does not match the DNA of the two Burmese men on trial for murder.

DNA taken from the alleged murder weapon, a garden hoe, does not match the DNA of the two Burmese men on trial for murder.

Celebrity forensic scientist Dr. Pornthip Rojanasunand provided this assessment in testimony today in the high-profile ongoing Koh Tao murder trial currently taking place on the island of Koh Samui.


A key part of the prosecution's case is a match between DNA samples found on the victim's body and the bodies of the two defendants.

Defence lawyers asked for the police to hand over the DNA samples that the police used to make this match, for independent verification, but were told by police that there was nothing left of the evidence for re-testing.

Almost a year after the murders, police did agree to hand over the garden hoe murder weapon, as well as a shoe and a plastic bag for independent examination and verification.
Police have testified in trial already that they did fail to take DNA samples from the garden hoe used in the murder, choosing to take fingerprints instead.

Unlike the police, Dr. Pornthip's team did take DNA samples from the garden hoe.

They found that there was DNA of two males on the bloody garden hoe found near the victim but that this DNA did not match that of the accused.

Traditional Thai police crime reenactment at crime scene by accused before evidence has actually been presented in a court of law.


Dr Pornthip was also critical of police handling of the crime scene and improperly collecting evidence at the crime scene.

Dr. Pornthip cited police failure to analyse the blood that was found at the crime scene.

Dr. Pornthip also cited the moving of one victim's body from the place where she was killed, an action that could potentially destroy evidence.

Police have previously been accused of intimidation and abuse of witnesses also.

Dr. Pornthip is the head of the Central Institute of Forensic Science under the Ministry of Justice that is independent of the police, a post she is due to retire from next month upon her 60th birthday.

Dr. Pornthip rose to celebrity status through a rivalry with the police in which she was highly critical of sub-standard police forensic work.

The crime scene shortly after the bodies had been removed.





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  • abuse (noun): cruel, violent or unfair treatment, especially of someone who does not have the power to prevent it - การข่มเหง, การปฏิบัติไม่ดีต่อ
  • accused: to be said to have done something wrong or committed a crime - ถูกกล่าวหา
  • alleged: claimed to be true although not yet proven; claimed to have done something wrong but not yet proven - ที่ถูกกล่าวหา
  • assessment: a judgment or opinion - การประเมิน
  • bloody (verb): to injure a part of someone's body so that it bleeds - ทำให้มีเลือดออก
  • case: a matter that is being officially investigated or heard by a court - คดี
  • celebrity: someone who is famous, especially in the entertainment business - คนมีชื่อเสียง
  • cited: mentioned as an example, explanation or proof of something else - อ้าง, กล่าวอ้าง
  • collect (verb): to gather together a group/set/amount of things, often of the same sort - สะสม, เก็บรวบรวม
  • crime scene: the place where a crime occurred - ที่เกิดการกระทำอาชญากรรม
  • critical (adj): saying that someone or something is bad or wrong - จับผิด
  • currently: at this time; now - ในปัจจุบัน
  • defence: all the things that are said and shown in a court case to prove that someone is not guilty - การสู้คดี
  • defendant: someone who has been accused of a crime and is on trial - จำเลย
  • destroy (verb): to damage something so badly that it no longer exists, works, etc - ทำลาย
  • due to: scheduled to - มีกำหนด
  • evidence: facts statements or objects that help to prove whether or not someone has committed a crime - หลักฐาน
  • examination (noun.): inspection, investigation, looking closely at the facts and details in a case in order to make a decision or judgement - การตรวจสอบ, การพิจารณาอย่างละเอียด
  • fingerprint: a mark that you leave on something when you touch it, showing the pattern of lines on the skin of your fingers - รอยนิ้วมือ
  • forensic: relating to the use of scientific methods to solve  crimes or to find out why something happened - เกี่ยวกับนิติวิทยาศาสตร์
  • forensic science: the use of scientific methods to solve  crimes or to find out why something happened - นิติวิทยาศาสตร์
  • hand over: to give somebody else control or the responsibility for something - มอบ
  • handle: to be able deal with a situation - ควบคุมได้, จัดการได้
  • handle: to take action in order to deal with a difficult situation - ดูแล, จัดการ
  • high-profile: receiving a lot of attention from the public - ที่มีชื่อ ที่ได้รับความสนใจจากสาธารณชน
  • hoe (noun): a garden tool with a long handle and a blade, used for breaking up soil and removing weeds - จอบ
  • improperly (adv): in a way that is not suited or appropriate to the situation - ไม่เหมาะสม ไม่สมควร
  • independent: done or given by somebody who is not involved in a situation and so is able to judge it fairly - อิสระ, ไม่ขึ้นใคร
  • institute (noun): an organization that has a particular purpose, especially one that is connected with education or a particular profession; the building used by this organisation - สถาบัน,องค์การ,วิทยาลัย,สถาบันหนึ่งของมหาวิทยาลัย
  • intimidation: deliberately making someone feel frightened, especially so that they will do what you want - ขู่ขวัญ
  • key: most important - ที่สำคัญ
  • lawyer: an attorney - ทนาย
  • match: to be the same as or very similar to something else - เท่าเทียมกันกับ, เท่ากันกับ
  • Ministry of Justice (Justice Ministry): the ministry in charge of the criminal justice system, running prisons, aiding the Royal Thai Police and running the government's drug and narcotic control policies - กระทรวงยุติธรรม
  • murder (noun): the crime of intentionally killing a person - ฆาตกรรม
  • ongoing: continuing - อย่างต่อเนื่อง
  • post: a job/position in a company or organisation - ตำแหน่งการงาน
  • potentially: possibly - เป็นไปได้
  • previously: before -
  • prosecution: the person or organisation that tries to prove in court that someone has committed a crime - อัยการ
  • re-: to do again - อีก
  • retire: to stop working because you have reached the age where you are officially too old to work - เกษียณอายุ
  • rivalry: competition between groups of people, business, teams, etc. - การแข่งขันกัน,การเป็นคู่ต่อสู้กัน
  • sample: a small amount of a substance that is used for scientific or medical tests - ตัวอย่างทดลอง
  • status: position - สถานภาพ
  • sub-standard (adj.): below the standards for what can be accepted - ต่ำกว่ามาตรฐาน, ต่ำกว่าระดับปกติ
  • testify: to make a statement about something that you saw, know, or experienced, usually in a court of law or an official investigation - ให้การเป็นพยาน
  • testimony: a formal statement about something that you say, know or experienced, usually given to a court of law - คำให้การ
  • trial: the process of examining a case in a court of law and deciding whether someone has or has not committed a crime - การพิจารณาคดี
  • verification: the process of checking that something is true or accurate - การพิสูจน์ความจริง, การตรวจสอบความเป็นจริง
  • victim: someone who has been harmed, injured or killed as the result of a crime - เหยื่อผู้เคราะห์ร้าย
  • weapon: an object such as a knife, gun, bomb, etc. that is used for fighting or attacking somebody - อาวุธ
  • witness: a person who sees something happen or knows about something - ผู้ที่เห็นเหตุการณ์, พยาน
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