U.S. aviation regulators say they're considering rules that would require alcohol and drug testing for people who work on U.S. airline planes in foreign maintenance and repair shops.
The Federal Aviation Administration said Thursday that it is seeking public comments. The agency wants to know which countries allow random drug testing and which ban it, and which drugs are most abused in other countries.
Transportation workers in the U.S. are subject to drug and alcohol testing, and Congress voted in 2012 to extend the rules to foreign aircraft repair shops.
U.S. airlines have shifted some maintenance work overseas. Labor unions have raised safety arguments, saying that the foreign shops aren't regulated as closely as ones in the U.S.