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>> reporter: organizer jeffrey strauss tells us the ball builds on an old custom for setting clocks. >> it's a maritime tradition where ports around the world would lower the ball at noon. >> reporter: it was first lowed in times square in 1907. back then the ball was constructed of iron and wood and covered with 100 light bulbs. joining the millions watching it drop in person tonight are thousands of n.y.p.d. officers on patrol, some in plain clothes. >> this is a personal radiation detector. >> reporter: at police headquarters, commissioner ray kelly, show off some of the technology being used to safeguard revelers. when will you booth a sigh of are leaf? >> probably about 8:00 sunday morning. >> reporter: security hoar is incredibly tight. roads are blocked off, spectators and their bags are being searched while the rest of the world watches this on television. but let me tell you, it's pretty