^^^^^ Interesting that post got a down vote despite being accurate. The BFRO database is a critical database, but it by no means is scientifically based, complete, or can make any claims of accuracy. It is just one of the best available.
Even the FBI crime statistics are faulty, and are condemned on a regular basis, and that database is compiled as completely as possible, well funded, and participated in with near complete law enforcement agency participation nation wide.
Until government begins compiling a database under similar terms as all its other databases, we're stuck with private efforts, which are private. The owners build them, maintain them, provide access to them, etc under their own terms.