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Innocent people may have been jailed, and guilty ones may go free.
Sept. 26 marks the two-year anniversary of the students' disappearance.
Allegations of torture have bogged down the investigation into 43 students who went missing in 2014.
Some of the 123 suspects may have been tortured into confessing, making it even more difficult to know what really happened.
The missing 43 students and escape of "El Chapo" Guzmán may partly explain why the U.S. is slashing aid to Mexico.
The former mayor's wife said Mexican authorities threatened to arrest her children if she didn't go along with their story.
"This is going to be a tough week for Mexico on human rights."
The military and police have created a human rights crisis in Mexico, the Inter-American Commission on Human Rights says.
The students' relatives led a massive "march of national indignation" through the capital.