Related to this: Death note handwriting check

A lot of DNA must have rubbed off on the Death Notes. Unless the Death Note has a rule about fingerprints or DNA, I don't see how this isn't a plothole.

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    i think its going to be hard to answer this without a lot of knowledge on forensics. With that said, thumbprints are a result of oil, without some surface that is conducive to lifting the oil as it was imprinted, it wont happen. Paper absorbs the oil so you can't really get prints off of them AFAICT, There has to be a certain amount of DNA to sequence. I'm not sure if there is enough – ton.yeung Oct 14 '15 at 22:40
  • @ton.yeung What? I think that in general books can examined for DNA. I'm guessing the Death Note has a rule for such things. If not, this seems to be a plothole. – BCLC Oct 14 '15 at 22:41
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    i pressed enter by mistake, please read my edit – ton.yeung Oct 14 '15 at 22:41
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    i am quite sure the entire task force touched the Death Note to see Rem. unless they did the testing before then there would be (to my knowledge) no way to check if Light had touched it previously as his fingerprints and DNA could just have been from when the task force touched it – Memor-X Oct 14 '15 at 22:46
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    @BCLC memor makes a good point, i didn't watch the series so i didn't know about that. the notebook would definitely qualify as contaminated by that point. I think that means its nearly worthless from a forensics standpoint. And yes, lots and lots of artistic license, and then a healthy helping of bs. – ton.yeung Oct 14 '15 at 22:48

When the Kira Task Force recovered the Death Note from Kyosuke Higuchi there is 2 things which contaminated any DNA evidence on the Death Note:

  1. The Kira Task Force touched the Death Note to see Rem
  2. Light was holding onto the Death Note as part of his plan to reclaim ownership (when his memories returned)

To my knowledge there is no way to tell "when" fingerprints or DNA first made contact with an object being tested as such any of Light's DNA found on the Death Note can easily be explained by his interactions with it when the Death Note was recovered.

Remember that the idea was to capture Kira and convict him in a court of law and DNA on the Death Note would be inadmissible due to how it was handled. This is why the police tend to block of crime scenes ensure that the proper Chain of Evidence is met. In some cop shows there are times that, when a seal is broken or multiple undocumented people handled a particular piece of evidence, it can't be used in court.

Even if Light didn't touch the Death Note when it was recovered and L found Light's DNA on it, suspecting Light again after the 13-day rule seemed to show his innocence would not help L since up until now Light had been very cooperative in aiding the Task Force and they were all on good terms. He would first need to prove to the rest of the Task Force/Police that the 13-day rule is fake thus returning to what I have explained here and then rule out any other way Light's DNA could have gotten onto the Death Note after it's recovery.

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  • That about sums it up probably. Though I honestly don't think they would've found much by way of DNA even without being contaminated. Light knows about that and is anal about it. The switching of notes happens with him using a handkerchief to keep his DNA off it and I wouldn't doubt he wiped them both clean beforehand to clear him and Misa on the chance that they did try forensics testing. – Lenora Mar 7 '16 at 19:00

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