[A thriving subculture of road officers on the network now competes to see who can seize the most cash and contraband, describing their exploits in the network’s chat rooms and sharing “trophy shots” of money and drugs. Some police advocate highway interdiction as a way of raising revenue for cash-strapped municipalities.]

“All of our home towns are sitting on a tax-liberating gold mine,” Deputy Ron Hain of Kane County, Ill., wrote in a self-published book under a pseudonym. Hain is a marketing specialist for Desert Snow, a leading interdiction training firm based in Guthrie, Okla., whose founders also created Black Asphalt.

Hain’s book calls for “turning our police forces into present-day Robin Hoods.”