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During the 20 year span that it took the police to catch the Green River Killer the police collected a lot of evidence. the only techniques was matching DNA from saliva and semen that was found on the victims and matched it back to Ridgway. A recently unsealed court filing says "metal fragments containing aluminum were recovered from 5 dump sight locations: Green River, North Bend, Kerriston Road, Highway 18, I-90, and Highway 410. Detectives say "the aluminum ... is commonly used at Kenworth Truck." Thousands of pieces of evidence are packed away in a warehouse in South Seattle. It includes cigarette butts, car parts, bird's nests, anything investigators gathered from the scenes where 49 female bodies were found slain. Some evidence dates back to July 15, 1982. Blood samples, saliva swabs or anything that could contain DNA evidence is kept in a freezer. Court papers say that sperm that was found on one of the victim's body was matched to Ridgway in 13 locations tested by STR. With two other victims the DNA matched Ridgway 9 of 13 times, its a good match but not a perfect match.