More than a year after the U.S. Interior Department grounded hundreds of Chinese-made drones it was using to track wildfires and monitor dams, volcanoes and wildlife, it’s starting to look like they won’t be flying again any time soon — if ever.

A measure moving through Congress would impose a five-year ban on U.S. government purchases of drones manufactured or assembled in China. It reflects bipartisan concerns that devices made by companies such as DJI, which is based in Shenzhen, China, could facilitate Chinese spying on critical infrastructure.

But a ban could create problems for government users, since DJI dominates the global market for the small, low-altitude drones used by hobbyists, photographers, and many businesses and governments. There aren’t many affordable and reliable alternatives, said Carrick Detweiler, the CEO of Drone Amplified, which provides fire suppression payloads to drones operated by Interior and the U.S. Forest Service.

“Everyone I talk to in the federal government is moving away from DJI whether or not these bills are passed,” said Detweiler, who is also a computer science professor at the University of Nebraska-Lincoln. “Everyone wants a U.S. system to be there and to work, it’s just that the U.S. drone industry was killed off by DJI a decade ago. It’s going to take three or four years before we’re at parity.”

The proposed ban was recently folded into the broader American Innovation and Competitiveness Act, which was nearing passage in the Senate before it was abruptly postponed Friday. While the ban wouldn’t go into effect until 2023, many federal agencies have already imposed temporary restrictions on the use of Chinese drones. Some have begun to phase them out entirely.

But the ban could create other headaches. Because it would also ban federal funds from being used to buy or operate Chinese drones, it could hit police departments that rely on federal help to field new equipment. The Department of Homeland Security started halting such grants for Chinese-made drones last year.

The Interior Department said it flew more than 11,000 drone flights in 2019 before temporarily grounding its drones over cybersecurity concerns at the end of that year. Its drone program has been largely on hiatus since then, except for some emergency flights that are granted a waiver.

Inside the government, the drone ban has met some resistance from officials eager to get their existing drone fleets back in the air for missions that don’t require secrecy. Some trade groups have argued that any drone restrictions should be based on specific security standards, not their country of origin.

A summary of a recent Pentagon report obtained by Associated Press found “no malicious code or intent” in drone software made by DJI and used by the Interior Department. The report assessed software used to operate DJI’s “Government Edition” drones and some fixes that were made to address data leakage vulnerabilities found in earlier audits.

That May 6 document also made a big endorsement. “The DJI Government Edition versions that were tested, show no malicious code or intent and are recommended for use by government entities and forces working with US services,” wrote author Adam Prater, a technology expert and second chief warrant officer with the Army Special Operations Command.

Prater and the Interior Department declined to comment. In a statement, DJI spokesperson Adam Lisberg called the report summary “the strongest confirmation to date” of the safety and security of the company’s drones.