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DENVER — By its very nature, a lot of law enforcement happens after the fact. Police respond to a crime after it has taken place. And then the job is catch the criminal.

But Denver is at the forefront for a new approach to crime fighting that could create seismic changes in law enforcement. Investigators say what is happening here actually helps stop shootings before they happen.

Julie Hayden shows us the cutting edge methods forensics experts are using at the Denver Crime Lab in her video report above.