State and Statute: Delaware, Code Title 16 §§ 901 et seq.
What Is Reportable "Abuse": Physical injury or neglect by those responsible for the care, custody and control of the child; emotional or sexual abuse by anyone. 
Mandatory Reporters: Includes any person who knows or in good faith suspects child abuse or neglect. [903(a)]
How and Where to Report: Oral report to the Department of Services for Children, Youth and Their Families (a telephone call to the 24-hour, toll-free hotline (1-800-292-9582) is acceptable). "Written report, if requested, shall be made in accordance with the rules and regulations of the Division, or in accordance with the rules and regulations adopted by the Division." [904(a)]