Board Thread:General Discussion/@comment-25266931-20161228230634/@comment-27394867-20161229091504

KNN005 wrote: Okay but what about if she ever went to a clinic or the school nurse. Shouldn't her blood be forever altered? She fought in the team battles of season 3 so I know they had to do a physical before the fights. And maybe again if she got hit. A few reasons:

- 1: Blood tests are not done in physicals.

- 2: Even if they were done, blood tests are normally targetted to check for specific issues health issues, there would need a reason to do the specific tests that are used to check for parasites (Enzyme-linked Immunosorbent Assay (ELISA) Test, Latex Agglutination Test, and Blood Smear). As far as sport competitions go, there is absolutely no reason to test for parasites. Sport competitions, such as the Olympics, only check for doping traces, nothing else.

-3 : When it is decided that blood testing should be done, it is rarely done on everyone, they select athletes based on specific methods. One thing is certain: not everyone is tested. They may have reasons to test team champions in the doubles and singles, but testing every participants would just take way more time than needed and additional costs. Cinder would not have been noticed enough during the competition to warrant specific testing on her.

Sources: http://www.brighthub.com/science/medical/articles/77227.aspx

http://www.usada.org/testing/sample-collection-process/blood/

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Also, in your original post, you ask why is there no sensors to detect Grimms at a DNA (notice the N is capitalized) level. First, parasites are not detectable in a host by "reading their DNA", actually, only a very small subset of diseases (known as retrovirus) can modify DNA. So already that fails.

Sources: https://www.ncbi.nlm.nih.gov/books/NBK52875/

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On heat sensors: that would simply not work. First, as highlighted above, parasites cannot be detected by heat alone, they are a too small signature against an already hot (human body) backdrop to be detected. The only way it could be known that something is off with that person is if the parasite would change radically the heat of the host by inducing a fever or an hypothermia. And in that specific scenario, there would be hundreds of reason for such health issues, parasites being only one of them, and the odds of that specific parasite being a grimm one are tiny, if not unheard of in the world of Remnant. There is literally no reason to invest in such measures.

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TL&DR: What you suggested to detect the parasite do not work the way you suggest.