Tom Dreisbach

In 2013, Charlotte, N.C., police officer Randall Kerrick shot and killed Jonathan Ferrell, a black man who was unarmed.

Video from a police car captured part of the encounter, but the shooting took place off-camera. Kerrick was subsequently charged with voluntary manslaughter for shooting Ferrell, and the trial unfolded in 2015. A key piece of evidence was the video. But the way you see that video depends on who you are.

When Kevin Polly first started abusing Opana ER, a potent prescription opioid painkiller, he took pills — or fractions of pills — and crushed them into a fine powder, then snorted it.

When Opana pills are swallowed, they release their painkilling ingredient over 12 hours. If the pills were crushed and snorted, though, the drug was released in a single dose.

"Just think about it," Polly says, "12 hours of medicine, and, 'BAM!' you're getting it all at once."

The message from park rangers, amateur metal detectors and regular fisherman at California's Lake Perris is unanimous: The water is lower than they've ever seen it.