Laura Spaulding Saw a Potential Niche in Meth Labs and Other Sites

As a police officer, Laura Spaulding tried to clean up the streets of Kansas City, Mo. Then she was inspired to clean up crime in a very different way.

Ms. Spaulding saw many methamphetamine labs and crime scenes during her seven years on the force. “I used to think, ‘I wonder what happens to these when we’re done?’ ” she says.

Then, one Christmas, she responded to a shooting at a family gathering. The mother, who wasn’t…