Volume 23, Issue 3 (July 1978)
Identification of Suitable Plaster for Crime-Scene Casting
Over the years police literature has generally recommended plaster of Paris  or dental plaster  to make casts at crime scenes. Even extremely unsophisticated testing indicates that different types of plaster vary considerably in tensile strength, hardness, and setting times under similar environmental conditions. Test studies indicate that plaster of Paris and dental plaster are the least suitable materials for police use because they are the least resistant to breakage and abrasion .