IPUMS provides census and survey data from around the world integrated across time and space. IPUMS integration and documentation makes it easy to study change, conduct comparative research, merge information across data types, and analyze individuals within family and community contexts. Data and services available free of charge.
The National Conference of State Legislatures provides you with information on law enforcement legislation that has been introduced in the 50 states and the District of Columbia. The database contains policing bills and executive orders.