That is not the way it works. Unfortunately, sex crimes are the most under reported crime, as well as the most over reported false report of a crime. Therefore, in most jurisdictions, and especially in the jurisdiction this man was arrested in, charges are not brought without substanative evidence against the accused.
I don't have the details of this case, but I am shocked that so many people here would lay blame with a sixteen year old when a teacher/instructor/band coach would engage in sexual activity with her.
It is plain and simple wrong on his part!
Often these cases are a guy befriending the students he is working with, then finding the shy, introverted student who doesn't get attention from the boys and starting a relationship with them.
Again, I don't have particulars on this investigation, however, I am familiar with the way these investigations are conducted, as the study of people who commit these crimes.
Everyone is entitled to thier opinion, but there has been some unfair speculation about victims. I would suggest if you don't know, don't work in the field, then perhaps you should comment on the suspect and leave speculation about the victim alone.
If she is an innocent, and she hears or reads this, then isn't that just victimizing her again?