查无实据

shì chū yǒu yīn ér qiě chá wú shí jù

事出有因，而且查无实据。

An investigation was called for, but no evidence was found.

chá wú shí jù zhǐ pà shì wū gào

查无实据，只怕是诬告。

No evidence has been found in the case so far and therefore it is probably a libelous suit.