How to know if an investment sheme is a scam or or not?

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Every days we heard about victims of the scams evrewhere in the world. And I know many security corporate are still figthing against them.That is the raison why I wondere if there is not a website where people can control if a wedsite is good or fraudulent before joinnig and investing the monney?Like www.FBI.com or something like this....tell us something....