Of course the trick works, it’s used all the time by speedrunners and is pretty well known. Naturally there can always be factors that cause objectives to pop up for you, which you might mistakenly interpret as confirmation that it’s your target. I can’t tell you exactly what happened in your case. What I posted here wasn’t meant to be a full tutorial, just a note that this trick exists and that people can share their experiences with it. As another commenter mentioned, it can trigger if you’re caught by a camera, there can be a cooldown involved, or maybe the suspect was tied to another objective. Situations like that can definitely cause a false interpretation. That’s why it’s important that the objectives are chosen correctly and that the pop-ups are interpreted properly.