Dao has a past of felony charges. He prescribed drugs to a patient in exchange for sexual relations and spent years trying to reclaim his suspended medical license
. Despite his distraught past, there was no evidence the airlines knew any of his background information - thus, his past did not contribute to the way he was handled on the aircraft, the (https://www.apnews.com/092b2c60f17643fe8990b49536cc7dc7/United-pledges-to-review-policies-on-removal-of-passengers) Associated Press reported Wednesday.
The scandal came to light in late November 2004, when Bach McComb, a 47-year-old Florida osteopath with a suspended medical license
, injected himself and three others with improperly diluted amounts of raw toxin obtained directly from List Biological Laboratories, a Northern California research laboratory.