A perfect example of what @mey621 and @heathermarlowe have been saying, here quoting University of Kansas law professor Corey Rayburn Yung:
Backlog “implies that the untested rape kits were in a queue awaiting testing by overburdened labs…. That does not reflect the reality across the United States. In fact, untested rape kits were often simply discarded in warehouses, trash depositories, or storage closets with no intention to ever test the contents of the kits.”