No, all commandements applied to the game (such like N°1 etc).
Certainly, many of them are exclusively applied to the detective, but the wording is different for some of them. Again, you cannot use the original commandements, since Ryukishi tailored them as he sees fit.
Commandement 8 doesn't involve the detective's conclusion. It is general:
提示されない手がかりでの解決を禁ず。
The solution provided without any clue/proof is prohibited.
It is NOT only applied to the detective, but it is a general rule.
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