A new audit by the Inspector General for Homeland Security says agencies within the Department missed at least one chance to save money on tools used to find drugs and explosives.

U.S. Customs and Border Protection was the top user of these handheld chemical-identification devices. But they’re also used by other Homeland Security subagencies like the Coast Guard, and the Transportation Security Administration.

The Inspector General report says a total of five subagencies spent about $48 million combined on the devices. They bought different brands with different capabilities at different prices.

The subagencies aren’t required to work together on small purchases. But the Inspector General says doing so could have meant big savings.

Homeland Security replied that it will come up with a way to identify common needs across subagencies. But the Department said doing a yearly item-by-item spend-analysis would take too much time and staff.