From Popular Communications, June 1991:
On April 20th, The Press Democrat, of Santa Rosa, Calif., reported that a scanner owner had contacted the police in the community of Rohnert Park to say that he was overhearing cordless phone conversations concerning sales of illegal drugs. The monitor, code named Zorro by the police, turned over thirteen tapes of such conversations made over a two month period.
Police took along a marijuana-sniffing cocker spaniel when they showed up at the suspect’s home with a warrant one morning. Identifying themselves, they broke down the door and found a man and a woman, each with a loaded gun. They also found a large amount of cash, some cocaine, marijuana, marijuana plants, and assorted marijuana cultivating paraphernalia. (Source)