Abelino's knee injury, Credcencio's headaches and Bernado's stomach ache- couldn't be treated by mainstream doctors in Washington as there was a language barrier where they were unable to explain their issue.
Cultural barriers as the doctors made stereotypes and assumed that all of their problems were a consequence of drinking alcohol, blaming the patient for their condition- 'myopic vision' only focusing on symptoms rather than person as a whole.
Racial differences restrict Holmes from fully understanding Triqui- at beginning of ethnography there were '3 army soldiers' that were on bus and they assumed he was a coyote trying to help Triqui cross border so they can get jobs. Holmes denies it and is then questioned by soldier saying "then why are you taking all these guys"
Habitus-Holmes struggling to sleep in a shared room on the floor