be under suspicion

To be suspected of some wrongdoing. Ever since that leak of private emails, everything the CEO has done has been under suspicion. As far as I'm concerned, the victim's husband is under suspicion until we interrogate him. I can't go into business with Mike because I know he's done shady things in the past. He's always going to be under suspicion in my mind.

be under suˈspicion (of something)

be the person that the police think has committed a crime (although they cannot prove it yet): He was still under suspicion and he knew the police were watching him.