Forensic value

Tim Downs, First the Dead, a bug man novel, Nasville, Thomas Nelson, 2007, p. 108.

“I found caddis flies—they’re aquatic insects, one of the few that have been shown to have forensic value. The caddis fly lays its eggs on the surface of water; the eggs then sink and hatch, and the larvae attach themselves to whatever they happen to find nearby-including a body ».