Barely half of all murders in California are solved and cleared by police. About 21,600 Californians were murdered between 2003 and 2012, according to the California Department of Justice. Police identified and found about 12,200 murderers during the same period - for a clearance rate of roughly 56 percent. read more
According to the FBI, 35-40% of all homicides go unsolved. [1] Here are some stats that I found online for unsolved murder rates by state, which uses an assumption that those homicides listed with "unknown race" are unsolved (a reasonable assumption to me) - the higher the rate, the worse the statistics. read more