turtle-bienhoa
It depends on how much they care, really. If it's just traffic police, they would be more concerned with their job than ticking me off. Else, it's a game of chance.
One of those times when it turned wrong was when I captured plate 60C-1096 (nomer23286899), when a police officer gave me a mild warning. I explained that I was doing this as a hobby, and while he did understand that, he still gave me a slight caution not to upload this on the web with defamatory or erroneous (however the law defines them) comments. Of course, I was still a bit spooked after this.
Though, when I finally got the means to buy a 360-degree camera, I wouldn't have to sneak up on governmental or military vehicles again.
Well, there's a time that it went wrong for me. I remember it happened few months ago when I photographed a traffic police Wave. Then the officer near there asked me what were I doing there, threatened to take me to the nearest local police station and force me to delete it. Thank god they didn't confiscated my phone though. After I deleted the photo, they let me go with a warning. I think they acted like that because it was near an embassy and Hanoi is already a sensitive place. Still, everytime I remember that day it still sends chills down my spine and I learned a lesson: Only take photos of police/military vehicles when the vehicle is unoccupied, no one is near it and parked in a normal area. Though after reading some laws, it turns out that civilians could photo traffic police as long as they don't mess with them but I think it's the best to not ticking them. Anyways, thanks for the answer and I hope you get that 360-degree camera soon, hopefully I can also get one in the future when I could make some cash.