Earlier quoted context omitted.
I think you made just the leap the authors intended you to. I wish the authors had included a link to that study so we could see what "suspected of" means exactly.
I don't need a link to a study to tell you what it means. The meaning is exactly the same as in normal speech, too bad for you since you'll have to do even more mental gymnastics to resolve your cognitive dissonance. It means someone was suspected (e.g. were at any time a suspect during the investigation), regardless of whether they actually committed anything or not.
Ok then.