AZ Supreme Court hears case of drug-sniffing canine 

About four years ago, police led a drug-sniffing dog to the garage of Jose Salvador Guillen, asked his wife for permission to enter the garage and then detected an odor of marijuana. Police, who were acting on a tip they had received eight months prior, obtained a search warrant and discovered bales of marijuana inside freezers in the garage. Guillen was later arrested and charged with possession of four pounds of the illegal narcotic.