well on the flip side, it can provide an easier way for the cartels to stash their money away and evade law enforcement.
The truth is that the cartels don't need Bitcoins to stash their money. Actually they will never even consider a volatile currency such as Bitcoin. The cartels own multiple banks and businesses in Mexico and abroad (especially in the Caribbean). They also control a large number of ghost companies. It is not a problem for them, to transfer or stash large amounts of money.