1836: Marsh test (used for detecting arsenic poisoning) invented by James Marsh (1794–1846).

1888–1895: Fingerprint classification method developed by Sir Francis Galton (1822–1911); a breakthrough in forensic science.

1910: First use of wireless telegraphy in the arrest of a criminal, Dr Crippen.

1984: DNA fingerprints are discovered by Alec Jeffreys (born 1950).

1987: Process of DNA profiling developed by Alec Jeffreys (born 1950).

1995: World’s first national flop DNA database developed: National DNA Database.