Chafetz Chaim, Part One, The Prohibition Against Lashon Hara, Principle 7
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וְדַוְקָא אִם הֵם נִכָּרִים מַמָּשׁ, דְּהַיְנוּ (כו) שֶׁהֵם מַגִּיעוֹת לְעִנְיַן הַסִפּוּר, וְגַם רָאָה אֶת הַדְּבָרִים הַנִּכָּרִים בְּעַצְמוֹ. אֲבָל אִם הֵם רְחוֹקִין מִזֶּה רַק הוּא כְּעֵין דָּבָר הַנִּכָּר קְצָת, אוֹ שֶׁלֹּא רָאָה אֶת הַדְּבָרִים הַנִּכָּרִים בְּעַצְמוֹ (כז) רַק שְׁמָעָן מִפִּי אֲחֵרִים, אֵין לוֹ בָּזֶה שׁוּם יִתְרוֹן כְּלָל.
And this applies only if they are real indications; that is, only if they relate directly to the story, and he saw them himself. But if they are far from it [the story] and are only slight indications, or if he did not see them himself, but only heard about them from others, he has no advantage in this [towards acceptance] at all.