Violence is an inherent feature of the trade in illicit drugs, but the violence generated by Mexico's drug trafficking organizations (DTOs) in recent years has been unprecedented and remarkably brutal. The tactics-including mass killings, the use of torture and dismemberment, and the phenomena of car bombs-have led some analysts to speculate whether the violence has been transformed into something new, perhaps requiring a different set of policy responses. Most analysts estimate there have been at least 60,000 homicides related to organized crime since 2006. Some analysts see evidence that the number of organized crime-style homicides in Mexico may have reached a plateau in 2012, while other observers maintain there was a decline in the number of killings. It is widely believed that the steep increase in organized crime-related homicides during the six-year administration of Mexican President Felipe Calderón (2006-2012) is likely to trend down far more slowly than it rose.