The arrest rate for murders by teens ages 15 to 19 dropped 27 percent in 1995.

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Other forces that had more than halved the arrest rate were Humberside, Hertfordshire, Suffolk, West Midlands, West Mercia, Gloucestershire, North Wales, Warwickshire and Lancashire.

BBC: Child arrests continue to fall, says Howard League

Another study showed that the arrest rate of mentally ill people rose five-fold in the first eight years after the rules tightened about whom was allowed into mental hospitals.

ECONOMIST: Mental illness

Reno conceded the arrest rate is still too high.

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According to the largest study of released prisoners, conducted by the Bureau of Justice, the re-arrest rate for sex offenders is lower than that for perpetrators of any violent crime except murder.

NEWYORKER: The Science of Sex Abuse

The rate of arrest and prosecution in the country is 7%, said former detective Rudolph Zinn, who wrote a book about home invasions and now trains South African police.

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"It is telling that the Department of Justice's charges against Kurt Mix surround efforts to cover up the fact that BP's public estimates of the oil flow rate were far lower than the actual flow rate, " the group said in a statement on the arrest.

CNN: First criminal charges filed in BP oil spill