A suspicion of something bad and illegal is an accusation. There's really no real distinction. You wouldn't say this kind of things to anyone without an eviden

A suspicion of something bad and illegal is an accusation. There's really no real distinction. You wouldn't say this kind of things to anyone without an evidence. "Hey boss. I suspect my teammate commits a fraud. But it's just a suspicion! I don't have any evidence!" Now replace fraud with equally heinous crimes like pedophilia and murder.