Meth cartels destroy Mexican city

To understand the violence and its impact on the city, The Times conducted more than three dozen interviews over the last nine months with law enforcement officials, criminal justice experts, gang members, victims and their families.

They blamed one drug for the growing carnage: methamphetamine, or as it is known in Spanish, cristal.At $2 a dose — and falling as manufacturers create cheaper production methods — it is sold by thousands of competing dealers scattered across the city, from the dusty slums to wealthier parts of town, such as Buena Vista, where Castillo grew up.Castillo first tried meth as a teenager in San Diego, where he spent part of his childhood in the early aughts. His friends told him it would allow him to stay up playing video games longer.

My home town has a bit of this.  Meth is a military grade nerve agents, it destroys the ability of the brain to maintain emotional stability. Victims begin killing like zombies.  Fighting meth cartels is tough business, like fighting swarms of zombies.