Having evidence is not really a problem. In Mexico, you will see narcos in the streets with very outlandish behavior.
With a functioning judiciary system they would be arrested and jailed easily and immediately.
The problem is that drug cartels have control of the everything, including the police and the judiciary system. You should read about the meetings where they show to the policemen what they do to the ones who betray them; it's terrifying.
Having evidence is not really a problem. In Mexico, you will see narcos in the streets with very outlandish behavior. With a functioning judiciary system they would be arrested and jailed easily and immediately.
The problem is that drug cartels have control of the everything, including the police and the judiciary system. You should read about the meetings where they show to the policemen what they do to the ones who betray them; it's terrifying.