be above suspicion

To not be suspected of any wrongdoing or crime, as due to one's reputation, status, etc. Because everyone thought he was such a good citizen, he was above suspicion after the robbery. An innocent-looking young girl like you could get the money and still be totally above suspicion with the cops. No, don't dismiss the husband yet—in murder cases like this, the husband is never above suspicion.

be aˌbove/beˌyond suˈspicion

be so good or honest that nobody thinks you would do something bad: He is absolutely beyond suspicion.