 The number of no-knock raids has increased from 3,000 in 1981 to more than 50,000 in 2005, according to Peter Kraska, a criminologist at Eastern Kentucky University in Richmond.Raids that lead to deaths of innocent people are increasingly common; since the early 1980s, forty bystanders have been killed, according to the Cato Institute in Washington, D.C.In Utah, no-knock warrants make up about 40% of all warrants served.