Specifically, does town or State social services accompany the police?
Yes, we have a protocol.
The Police Department has assigned a full-time Detective to Family Services. He immediately follows up on domestic matters, runaways, suicides/attempts and at-risk persons (elder and mental health matters). He works closely with Lexington's Human Services Department and the Community Crisis Intervention Team. He may enlist the assistance of the School Resource Officer who communicates with School deans and counselors.
We also have the Advocates located in Waltham who can respond to emergency calls for emotional and mental health emergencies. We are a member of the Domestic Violence Service Network (DVSN) and the Central Middlesex Police Partnership (CMPP) who contracts with Eliot Community services for social workers.
Given the example of 'child' abuse, we would immediately notify the Department of Children and Families as a mandatory reporter. They will come to a scene if the circumstances require.