Can passive smoking of cannabis show on a hair test?

To the contrary --

Hair was once thought to record evidence of drug ingestion like rings on a tree. Decades of research has shown that external drug contamination can penetrate hair when moistened and cause the hair test to incorrectly identify the individual as a drug user. For this reason among others, the United States governmental agency charged with drug testing oversight has refused to authorize hair as a method of drug testing. They have published their concerns in the Federal Register. Commercial entities, for obvious reasons, continue to promugate misleading information about hair testing reliability.