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our public affairs staff can provide you contact information after the press conference about how to get in touch with them. drug and alcohol testing is required for part 121 carriers. part 121 carriers are commercial operators based in the united states. part 129 refers to those commercial operators that are based in foreign countries. under part 121 requirements, crews involved in an accident are required to be tested for drugs and alcohol. we made inquiries after our arrival on scene regarding drug and alcohol testing. none of the crew members on asiana flight 214 were tested for drugs and alcohol prior -- post-crash.