YOU SAID:

if the cops didn't see it I didn't do it

INTO JAPANESE

警察が見ていなくても私はやっていない

BACK INTO ENGLISH

If the police hadn't watched, I wouldn't have done it.

INTO JAPANESE

警察が見ていなかったら、私はそれをしなかっただろう。

BACK INTO ENGLISH

If the police hadn't watched, I wouldn't have done it.