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Professional development is lacking, experts say, but costs can be prohibitory.
Civil rights advocates call for more minority recruiting to police forces.
Security guards outnumber government officers 3-to-2, but most have less training.
Stigma and previous encounters with police are among the obstacles.
Why is it so hard to get these life and death numbers?
Police officers say they have less discretion about how they do their jobs.
Some cops like them, but other criminal justice experts are skeptical.
Implementing the cameras costs means more than just new equipment.
