A Labrador retriever checks an inmate for traces of narcotics at California State Prison, Solano, in Vacaville in 2015.
A Labrador retriever checks an inmate for traces of narcotics at California State Prison, Solano, in Vacaville in 2015. Rich Pedroncelli Associated Press file
A Labrador retriever checks an inmate for traces of narcotics at California State Prison, Solano, in Vacaville in 2015. Rich Pedroncelli Associated Press file