Do human tears have DNA?

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Gholam Reza Talei

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

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.