reporter: commandante rorosalba- as a grandmother, loving and tolerant. but she's one tough cop.ost: recent years have seen mexican farmers growing opium poppies to feed the growing demand for heroin in the u.s. its current addiction epidemic began with massive over-prescription of opioid pain relievers in the 1990's. with big pharma aggressively marketing the drugs and downplaying their addictive nature, sales quadrupled between 1999 and 2014 -- and their potency also increased. the number of addicts -- and drug fatalities s -- is skyrocketing. in 2015 alone, 33,000 people died of an overdose. the government has attempted to stem prescription opioid abuse by making them less available. as a result, more and more people are now switching to heroin. according to a recent national survey, nearly 2.6 million americans have used heroin. reporter: corey long is 24. he likes to play guitar. he has a girlfriend, a high school diploma, and a job. and he is a recovering heroion addict. opioid drugs were once considered a problem exclusive to america's inner cities. but in the past few dec