Cultivation theory is related to the CSI effect in that cultivation theory argues that the CSI effect is real and should happen. In other words, the CSI effect can be seen as proof of the validity of cultivation theory.
Cultivation theory holds that people who watch a great deal of television will come to have their sense of reality altered to some degree. They will come to believe that the real world really is as it is portrayed on television. The CSI effect can be seen as proof of this. In the CSI effect, people have come to believe that forensic science should be able to prove who committed every crime beyond a reasonable doubt. By watching these shows, people have come to believe that prosecutors should be able to come up with scientific proof in any case. This raises the bar for prosecutors in the minds of potential jurors.
If the CSI effect is real, it would be proof of the validity of cultivation theory.