Knives made from conchoidal fracturing (i.e., the breaking of stone) are manufactured using the ancient method of flintknapping, which requires working a piece of stone from opposing bilateral edges in order to shape and thin the stone into the desired blade or tool. In conchoidal fracturing, the stone conducts a shock wave in each direction, so the stone breaks evenly. This method necessarily results in the formation of a double-edged knife or tool. Evidently, stone knives are too fragile to be used violently, but they can be functional to hunters in cleaning game. In addition, conchoidally fractured knives and other implements (e.g., arrowheads), are bought and sold at art shows by knife enthusiasts and collectors of artifacts. Although there apparently is no problem involving the use of conchoidally fractured knives to commit crimes, under current law the possession of these brittle stone knives is prohibited because they meet the definition of a dangerous weapon under the Michigan Penal Code. As such, they cannot legally be carried or transported, and violators are subject to a five-year felony penalty. Some people believe that knives made by conchoidal fracturing should be exempt from the Penal Code's definition of dangerous weapon so that enthusiasts of this manufacturing process and the artifacts that were made using that process can pursue their interest without violating the law.