Mexico is considering eliminating mandatory pretrial detention (Prisión Preventiva Oficiosa PPO, where instead of a judge deciding if an individual is a flight risk, the judge must send the accused to prison, regardless of evidence even). Protesters are arguing that it is a 'sentence without a conviction' and people have been held in prison for years (some for decades) without being found guilty. So far the Mexican government has resisted removing PPO. Mexico City's Congress (and President Sheinbaum) recently approved a document that expanded the list of crimes that trigger automatic prison (without trial), including an extorsion or synthetic drugs [focus on fentanyl] traficking charge) most famously, but also simple smuggling, tax fraud, and small-scale drug dealing.
Some argue that PPO is also a political weapon. PPO also puts Mexico in conflict with international courts, civil rights organizations.
The list of PPO is pretty inclusive. Homicide, rape, kidnapping, organized crime, violence against minors, human trafficking, burglary of house, cargo theft, corruption, use of explosives or military grade firearms (the fentanyl addition is classed here, it seems, in national security), and the new financial crimes additions (extortion, tax fraud, smuggling).