YOU SAID:

To vouch this is no proof

INTO JAPANESE

これを保証することは証拠にはなりません

BACK INTO ENGLISH

It is not proof to vouch for this

INTO JAPANESE

これを保証する証拠にはなりません

BACK INTO ENGLISH

There is no evidence to support this

INTO JAPANESE

これを裏付ける証拠はない

BACK INTO ENGLISH

there is no evidence to support this

INTO JAPANESE

これを裏付ける証拠はない

BACK INTO ENGLISH

there is no evidence to support this