CHICAGO (CBS) -- Murders in Chicago were down last year, but it's a different story when it comes to the number of murders actually solved.
As WBBM Newsradio's Steve Miller reports, the murder clearance rate – the number of homicides that were solved the same year – has slipped.
LISTEN: WBBM Newsradio's Steve Miller reports
"Forensic evidence may need processing time... so it stands to reason that an investigation may extend beyond a calendar year," a police spokeswoman said.
But in 1991, for example, the murder clearance rate was 80 percent in Chicago – 927 murders committed, 741 solved.
In the early 1990s as a whole, the rate was 72 to 73 percent.
By 2005, it had slipped to 42 percent.
Last year, it was 30 percent, meaning fewer than a third of the murders committed in 2011 were solved last year.
If there's any good news, the 2011 figure is slightly up from 28 percent in 2010.
for more features.