From my and my friends' experience, they suck.
My best friend was bullied after school by some adult (18-19) girls, the police caught them and asked her to come to the station. They placed the suspects in the room, and asked my friend to look through the mirror and tell which ones attacked her. She pointed the two who did it, and then... the cops went inside and took those girls, while my friend was still on the other side of the room.
So they got to see her face and swear + threaten a bit more. Stupidity at its finest.
My best friend was bullied after school by some adult (18-19) girls, the police caught them and asked her to come to the station. They placed the suspects in the room, and asked my friend to look through the mirror and tell which ones attacked her. She pointed the two who did it, and then... the cops went inside and took those girls, while my friend was still on the other side of the room.
So they got to see her face and swear + threaten a bit more. Stupidity at its finest.