再次读了一下Idaho那个杀人案件，DNA技术是一个方面，传统的“人民的眼睛是雪亮的”这种模式同样起了作用，找到了嫌疑人

当晚用过的车辆。就算没有DNA，嫌疑人也无处可逃了。工作量很大，12000多各类信息汇集，查了22000辆汽车。

 

But the case broke open after law enforcement asked the public for help finding a white Hyundai Elantra sedan seen near the home around the time of the killings. The Moscow Police Department made the request Dec. 7, and by the next day had to direct tips to a special FBI call center because so many were coming in. By mid-December, investigators were working through nearly 12,000 tips and had identified more than 22,000 vehicles matching that make and model.

• The evidence used by investigators: Authorities narrowed their focus to Kohberger after tracing his ownership of a white Hyundai Elantra seen in the area of the killings, according to two law enforcement sources. They also said his DNA was matched to genetic material recovered at the off-campus house where the students were stabbed to death. Investigators traced the DNA with the help of genetic genealogy, a source with knowledge of the case told CNN.