The best replacement for csi is law and order.

The best alternatives to csi are rated as following:
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★  detective
★  forensic science
★  bones
★  csr
★  real csi
★  svu
  soco
  masterspec
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  law order
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  ncis which is better
  tv csi

Your alternative for csi is not listed? Suggest!
Speaking about csi, one probably shouldn't forget about trace crossover.

Other search terms related to csi and their ratings are:
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Google Trends

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csi
law and order
grey\u0027s anatomy