A man allows police to take a DNA sample. Source: AFP

DNA technology now plays a key role in more than half of arrests and reports from crime scenes, as the number of people on the database grows.

Last financial year, DNA from crime scenes contributed to an arrest or a report in 52per cent of cases, up from 48per cent the previous year, reflecting an improvement in forensic science and crime scene investigation practices.

The South Australian Police annual report tabled in Parliament yesterday showed 97,396 suspects or offenders had samples entered on the DNA database, up from 84,629 in 2010-11.

While scientific work increasingly helps solve crimes, so does intelligence work.

During 2011-12 the Crime Gangs Task Force - which deals with organised crime and outlaw motorcycle gangs - arrested or reported 89 motorcycle gang members and 92 associates; seized 1175g of amphetamine, 130 cannabis plants, 5319g of cannabis, 165 ecstasy pills, 927 street deals of other illicit drugs; $139,000 in cash, 29 firearms and issued 42 barring orders.

Police Commissioner Gary Burns said victim-reported crime continued to drop, falling 5.6per cent in the past financial year (to 125,879 incidents) and 40.5per cent since 2000-01.

Other highlights in the report include:

18,534 reports received by Bank SA Crime Stoppers, resulting in 2066 crimes solved, 1166 suspects apprehended and $261,645 worth of property and cash recovered;

563,594 driver screening tests conducted, including 42,312 drivers tested for drug driving, 7779 cars impounded or clamped for hoon driving (compared to 7303 in 2010-11).

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DNA clues catch more criminals