use of science and technology:
-in 1901 fingerprint branch was set up
-in 1909 police bicycles were introduced to allow officers to pursue criminals more quickly
-by the 1930's police cars became more common and the 999 number was introduced
-CCTV was first used in 1960
-in 1980 the Police National Computer was introduced which held the records of 25 million people
-in 1988 the first DNA samples were used to convict a murder
-speed cameras introduced in 1992
-in 1995 the national fingerprint system and dna base were set up to share information
-more recent developments include biometric screening