Neal Smither, the founder and president of Crime Scene Cleaners, has cleaned up "thousands" of crime scenes. He's documented the work too, posting the gory images to an Instagram page that's attracted hundreds of thousands of followers. He spoke with us about his peculiar brand of janitorial work and why some people are interested in crime-scene photos.

Michael J. Tillman says 20 years in the crime-scene cleanup field have taught him how to walk the line between sensitive, personal care for a victim's family and maintaining a sense of remove so he can still come to work the next day.