Vice President Joe Biden is expected to visit Baltimore Tuesday afternoon to talk about the troubling backlog of untested rape kits around the country. Hundreds of thousands of these kits, containing potential DNA evidence from sexual assaults, have been languishing in police storage units and crime labs. The White House has proposed $41 million in new funding to help clear that backlog.

“I think it would send an extremely powerful message to the law enforcement agencies that have allowed the kits to collect dust that this will no longer be accepted,” says Linda Fairstein, a former sex crimes prosecutor in Manhattan and part of the End the Backlog campaign.

Almost six years ago, more than 11,000 kits were found in a police storage facility in Detroit. Testing so far has led to 15 convictions. The Michigan Women’s Foundation has turned to private donors to help clear the remaining backlog.