Original: The New York City Police Department ( NYPD ) , established in 1845 , is currently the largest police force in the United States , US DOJ Statistics 2000 with primary responsibilities in law enforcement and investigation within the five boroughs of New York City .
Simplified: The New York City Police Department ( NYPD ) , started in 1844 , is the largest police force in the United States , US DOJ Statistics 2000 .