I volunteered at a suicide hotline for about 4 years. We really only call the police in very specific situations- if someone tells a clear plan on how they are going to kill themselves or another person and it becomes evident that they are planning on going through with that plan. I think I called the police on 6 people that entire time (and I volunteered 6 hours a week for those 4 years)...5 of those told me their address so that I could send the police to their location to help. Just so you know if you do want to call in the future. It's very rare that we ever call the police on someone.