There's no way the president can elude responsibility because this is a strictly hierarchical presidential system. But everyone's responsibilities are also the responsibility of the president, and the president cannot claim that he does not know what was happening with his brother. That's simply absurd. I have no evidence that Carlos Salinas was involved in drug trafficking or in operations of drug trafficking. But what we know is that corruption is the basic tool of drug traffickers.
Corruption is their basic strategic weapon.
When American helicopters come to fight them, they fight back through corruption. They don't need another helicopter to bring down the American helicopters. They need to buy and to bribe the officials that run those helicopters and they do this all of the time. Every single big drug lord, every single cartel boss that has been detained by the Mexican authorities, has been detained in the company of federal police officials. They have always been around drug traffickers.