Yes, a person’s general demeanor and the way they carry themselves is evident from the start. After experience, I would think cops start to pick up on this.
Judging from the picture, the kid looks like a clean-cut respectable man. That first impression speaks loudly.
Looks can be deceiving. My DIL was in a Home Depot parking lot and a very clean cut, well dressed black guy approached her as she was putting items in the trunk of her convertible car. He said, “let me take that cart for you”. Then it got scary, she got in the car and so did he, ordered her to drive. Long story, but she survived by gunning the car to the front of the store and screamed for help. Then it got more interesting. The guy had an arrest record a mile long, however, he was a great looking guy.