Petra finds a marking in the wall at a crime scene. She believes it may have been caused by a knife. What are the procedures for handling such evidence?

First, Petra photographs and measures the mark, then makes a - (casting, lifting, scraping) of the hole. Then she collects all the knifes in the area for comparison. She packages each of these in an immovable - ( cardboard, plastic, glass) casing with a warning label that a sharp object is enclosed.