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She was turned away and then detained by Mexican immigration officials before being released because of her health conditions.

“I’ve had patients tell me they tried to hide their pregnancy so that their methadone provider didn’t know because they were worried they were going to be turned away,” Jones said.

Mr Elias said: "Once he turns away from you and gets into the vehicle he doesn't give off any threat."

The combination has made potential visitors scared to travel to the U.S. out of fear they, too, will be detained, turned away or targeted.

A group of attorneys who said they represent families of disappeared people was also turned away.