I'm very ignorant about Bitcoin, but given El Salvador's big problem with crime, doesn't adopting Bitcoin give the cartels an extremely easy way to launder their money?
Bitcoin has a public ledger, so once you know who the owner is of a particular address, you can view all of their past transactions and all the addresses of those transactions, potentially exposing a lot of metadata of their activities
There was an article a while back on Hacker News top list where the blog author explained, in actually very simple steps, how to launder it through services such as Tornado, to disjoin the trail of money. Pretty intelligent piece of work.
Bitcoin has a public ledger, so once you know who the owner is of a particular address, you can view all of their past transactions and all the addresses of those transactions, potentially exposing a lot of metadata of their activities