"Over the past several years, the nation has seen an uptick in the use and abuse of opioids—both prescription substances and non-prescription substances such as heroin. The estimated number of individuals who had used heroin was 914,000 in 2014. Further, about 586,000 individuals (0.2% of the 12 and older population) had a heroin use disorder in 2014. In addition to an increase in heroin use over the past several years, there has been a simultaneous increase in its availability in the United States. This has been fueled by a number of factors, including increased production and trafficking of heroin—principally by Mexican criminal networks..."