Do human tears have DNA?

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Alaa Hani Al-Charrakh Popular answer

Thank you Gholam Reza Talei

Gholam Reza Talei

tears does contamminated immediatly since secretted in place where many skin microbiota exist. Therefore yes you expect contaminated DNA .

Alaa Hani Al-Charrakh

Mohammad J Al-Jassani

Dear Dr. Alaa, Human Tears usually have No DNA because of nuclease (DNase I) presence. In some cases eDNA might be present and it is a sign of a dry eye disease (DED). Although, There are some nucleated cellular materials found in Human tears that might be used in forensic investigations.

Best Regards.

Kassim Amir hadi Taj-Aldean

Human tears have no DNA

Thank you all for your wonderful answers

Maysa Salih Al-Shukri

Human tears have no DNA, since there is no cells

Thank you Dr. Maysa Salih Al-Shukri, for your time and answer