Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Two Burmese men charged with the murders of British backpackers Hannah Witheridge and David Miller had their DNA re-taken in a dramatic courtroom scene today. The rare, if not unique, move was played out after lawyers defending migrants Zaw Lin and Wei Phyo questioned scientific methods applied when the men's DNA was initially taken by police. Earlier a police sergeant who had taken the first DNA samples following the arrest of the Burmese men admitted he had only taken swabs before in training and never from a 'real' suspect. The bodies of Miss Witheridge, 23, and Mr Miller, 24, were discovered in September last year, on Koh Tao Sairee Beach. But failures to investigate vital evidence is putting the trial in jeopardy.Lawyers for Zaw Lin and Wei Phyo demanded the pair had their DNA retakenThey questioned scientific methods applied when the DNA was initially takenPolice sergeant who took original samples admitted he had only taken swabs before in training and never from a 'real' suspectFailures to investigate vital evidence is putting the murder trial in jeopardy 
 Question:That resulted in a plea to the Koh Samui court by the defence team to have the _ re-taken there and then.

DNA