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.
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.