This is the 5987th most frequent Polish word.
śledczym
The Polish word "śledczym" means "investigative" or "investigator" (as an adjective or referring to someone conducting an investigation).
In this sentence, 'śledczym' is used as a noun in instrumental case to describe someone's role.
Jestem śledczym w tej sprawie.
I am the investigator in this case.
Here, 'śledczym' functions as an adjective in instrumental case describing the type of review.
Śledczym przeglądem dokumentów zajmuje się specjalna komisja.
A special committee is responsible for the investigative review of the documents.
In this example, 'śledczym' is a noun in instrumental case representing the person in the investigative role.