The NCMEC serves as a clearinghouse of information on missing and exploited children, provides technical assistance to citizens and law enforcement agencies, offers training to police and social service professionals, distributes photographs and descriptions of missing children nationwide, coordinates child protection efforts with the private sector, networks with nonprofit service providers and State clearinghouses on missing persons, and provides information on effective State legislation relevant to the protection of children. On April 2, 1990, the NCMEC merged with the Adam Walsh Child Resource Centers to strengthen the network of national and community-based resources available through headquarters in northern Virginia and branches in southern California, south Florida, upstate New York, and South Carolina. The NCMEC has used new technologies to enhance its ability to share case information needed to recover missing children; it has begun age-progressing of the photographs of long-term missing children and has also established the Information Analysis and Case Enhancement Unit to improve its crime and link analysis capabilities and better assist police agencies in the search for serial offenders who prey on children. Information is provided on the National Hotline, case management and legal technical assistance, training, photo distribution, prevention, public awareness, legislation, cases handled, and NCMEC income and expenses for 1990.