right for inmates but it also poses a security risk. it's one of the chief ways drugs and other contraband can be smuggled into the jail. >> at new york city's rikers island, we found the correctional staff wasn't about to let that happen. >> good afternoon, ladies and gentlemen. welcome to new york city department of corrections. >> my name is officer p. hunt, 9865. i'm a member of the k-9 unit, narcotics unit. today we're going to do a narcotics search. we board the bus and look for any type of illegal substance. crack, cocaine, marijuana. if you have it, now is the time to throw it on the floor or deposit it in that box over there. >> when leaving the bus to enter the jail facility, visitors are not only given a blunt warning about contraband, they're handed a number to correspond with their seat. then a drug-sniffing dog boards the bus. >> so my dog boards that bus and starts scratching seat number three, i'm going to look over and say that's who we have to search. >> right here, we found two empty balloons. now, a lot of people what they