Transcript for ABC News' David Muir Reports: Mexico to Be Sued for Human Rights Abuses Against Disabled
We turn next tonight to an ABC news investigation. Nearly a year ago, we took you to Mexico City, a city with a growing list of billionaires, and yet, in the shadow of so much wealth, the forgotten children. The government promised at the time major changes. So, tonight here, we go back to check, and you're about to see what we found. It was nearly a year ago, we traveled to Mexico City in search of the children. ABC news getting the government blacklist, obtained by disability rights inteional. So, authorities put these institutions on a blacklist. Yes. But they're still open? Yes. We discovered padlocks on doors and windows and we see a commotion outside this door. No doorknob, just a little girl peering out. Hola! She's locked in the bathroom. Government money keeps this place open. Other facilities not on the blacklist, and yet we find children with disabilities inside cages, rows of them locked up. He spends 24 hours a day in this cage? They take him out for one hour. The director of the facility at the time guiding our team, telling us they are all well taken care of here. They have a good quality of life. But after our visit, the ministry for social development in Mexico City, banning all cages and restraints. An apparent victory. But nearly a year later, we return. First, the facility with cages. The team was invited, but when we got there, they refused. But I ask, have they made any changes? "Yes," she tells me, but rings the bell to get in without us. We ask for just five minute, she says no. Take a look? So, they've closed the door on us, after initially telling the team we could come back a year later to see the changes. They tell us there are changes inside, but now won't allow us five minutes to see them. Presill larod lee guess gets a text from the government. So, the government has now said no, too. Yes. Are you convinced there are any changes? We cannot be sure anymore. We're off to the next stop, where a year ago, we witnessed children, this boy hanging by his hands over a treadmill. Their bodies wrapped in gauze and makeshift splints, than is what we found. You can see the gauze is still here, and they have, now E, told us they still use this. And they promised that they would change this since our visit? A asked the people here, the authorities just told them, well, it looked bad to use restraints. So, be careful. It looks bad. Then, we discover the children. A little boy, his hands in socks. Pretty little girl. And a a And what appears to be a little girl, her head slumped, tied up. We learn she is 17. And an American nurse, travel with the team, offers a simple suggestion. Make charts with pictures, engage the children. As we see Leonardo crawling to reach up for a newspaper. 24 hours later, we return, the 17-year-old is now outside. Fernanda. Her head comes up as soon as we talk to her. And Leonardo, who crawled over to that newspaper -- when we reach for his hand, he immediately puts his head on my arm. Suddenly, we see that smile. And the directordly tells us, she took that suggestion from the nurse. Already making charts of pictures. And he takes my hand to point to each one. Look, he's having me point. Leo is already using the charts. Leonardo, I want pizza. Ah! The director tells us, she's ready for change. So far, nothing from the government. We go to one last place. Nearly a year later, we return to another one of the facilities and we find that there are children of all ages here and yet no government help, no visits from the government. And just this afternoon, disability rights international revealing they are now filing an international suit, promises unkept. They promised almost a year ago to get rid of the cages, to replace the restraints. To help get children back out into the community Ando families and to foster care, if you will. Have we seen any of that? No. They signed documents, they made it look official before the cameras. But that translated into nothing. Overnight, the government telling ABC news, they have made changes. Saying they banned those cages. But again, they wouldn't show us. Which is why we keep coming back. The forgotten children and we will stay on the case.
This transcript has been automatically generated and may not be 100% accurate.