http://prawouam-stp.home.amu.edu.pl/m.htm

MATERIAŁ PORÓWNAWCZY zbiór wzorów pisma lub podpisów określonej osoby, przeznaczony na użytek ekspertyzy pisma ręcznego lub podpisów. Wzory pisma dzieli się na: 1) bezwpływowe (kreślone do celów innych niż ekspertyza, np. szkolnych, pracowniczych); 2) kreślone na polecenie. (WW)

MATERIAŁ WPŁYWOWY (termin niezalecany) materiał porównawczy kreślony na polecenie.

MATERIAŁ BEZWPŁYWOWY jeden z dwóch rodzajów materiału porównawczego.

http://www.forensicsciencesimplified.org/docs/how.html

When conducting examinations, forensic document examiners must have known specimens to which they compare the material in question. These samples may come from any number of known sources, such as a particular ink manufacturer or machine.

In cases involving handwriting, samples are usually divided into two types: requested writing specimens and collected writing specimens. Requested specimens are writings dictated by the investigator to the writer. These specimens are created under carefully controlled conditions, with the writer being closely monitored. Collected writing specimens, however, are writings that were completed by the subject prior to the investigation. Good sources of writing specimens may include items such as cancelled checks, letters, diaries, signed receipts, medical records, real estate contracts, tax records or other signed legal documents.