In what situations would you consult with the school psychologist?

Most students always respond effectively to positive reinforcement and are always engaged, working in the classroom, being productive, and staying on task. They are almost like little ants working along with you to accomplish the objectives of the day. My concerns usually raise with those students that are under performing and positive reinforcement is not  motivation for them. I would consult with a school psychologist when I have tried several strategies, interventions, and nothing works with that particular student. If a student has been sent several times to the principal's office, if meeting with parents doesn't seem to change anything, that is when I would consult with a specialist.
Many times parents will see the need to have their child tested because they see that they fail to maintain healthy relationships with other peers and the teacher, and they fail to succeed academically because their emotional/behavior challenges become a barrier to become successful academically in the school and concentrate in class.
On the other hand, if you see other red flags that sometimes come up, if a student is usually late, misses a lot of school, doesn't do homework, doesn't bring lunch, doesn't clean up nicely, those are signs that something is going on at the home, and as a teacher we should tell our supervisors if we think there might be signs of neglect or child abuse and immediately notify CPS.