Which example is not the proper use of a casting of a toolmark?
comparing with a photograph of a suspect tool
examining for other trace evidence adhering to the cast
comparing directly to a suspect tool
comparing with the cast of a suspect tool

Comparing with a photograph of a suspect tool, examining for other trace evidence adhering to the cast and the comparing with the cast of a suspect tool are the proper use of casting a tool mark. Therefore, comparing directly to a suspect tool is not the example of using proper use of casting tool mark.