Alleged cocaine quality control tester for Mexican drug cartel extradited to US / Mexico drug tsar's spectacular fall from grace culminates in NY court / At the epicenter of the Mexican drug trade, a deadly power struggle shuts down a city / Violent clashes between drug traffickers in the Mexican state of Sinaloa / Fentanyl, heroine and cocaine found in car muffler at U.S.-Mexico border / Carriers sneak life-saving drugs over border as Mexico battles opioid deaths / On mute: Tijuana passes law banning ballads praising Mexican drug trade