Received: 21 October 2019
Accepted: 9 December 2019
First Online: 7 January 2020
Compliance with ethical standards
: There are no financial or other relations that could lead to a conflict of interest.
: The analysis of Fu-F in postmortem whole blood specimens was requested by prosecutor’s office of the Lublin province authority. Small amounts of blank whole blood were collected from five volunteers after obtaining informed consent from each of them. This article does not contain any studies with animals performed by any of the authors.