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The lawyer for JonBenet Ramsey's brother laid out exactly why he plans to sue the crap out of CBS for airing "experts" who concluded Burke Ramsey killed his little sister.

Burke's lawyer, L. Lin Wood, came on "TMZ Live" and accused CBS of using "phony experts" on its documentary ... just so it could profit off the impending 20 year anniversary of JonBenet's unsolved murder.

Wood explained why he believe the evidence completely refutes the findings of "The Case of: JonBenet Ramsey." As we reported ... Wood intends to sue CBS for defamation.