reported. Those taking fentanyl-laced heroin are more likely to overdose because they do not know they also are ingesting the more powerful drug. The most high-profile death involving an accidental overdose of fentanyl was singer Prince. Fentanyl has surpassed heroin as a killer in several locales: in all of 2014 the CDC identified 998 fatal fentanyl overdoses in Ohio, which is the same number of deaths recorded in just the first five months of 2015. The US Attorney for the Northern District of Ohio stated: In 2016, the medical news site STAT reported that while Mexican cartels are the main source of heroin smuggled into the US, Chinese suppliers provide both raw fentanyl and the machinery necessary for its production. In Southern California, a home-operated drug lab with six pill presses was uncovered by federal agents; each machine was capable of producing thousands of pills an hour. Overdoses involving fentanyl have greatly contributed to the havoc caused by the opioid epidemic. In New Hampshire, two thirds of the fatal drug overdoses involved fentanyl, and most do not know that they are taking fentanyl. In 2017, a cluster of fentanyl overdoses in Florida was found to be caused by street sales of fentanyl pills sold as Xanax. According to the DEA, of fentanyl can be bought in China for $3,000 to $5,000, and then smuggled into the United States by mail or Mexican drug cartels to generate over $1.5million in revenue. The profitability of this drug has led dealers to adulterate other drugs with fentanyl without the knowledge of the drug user. In 2022, the FDA warned, that Xylazine, an animal tranquilizer, is increasingly being detected in heroin and illicit fentanyl. One study found that, although relatively uncommon, "the presence of fentanyl in the stimulant supply increased significantly between 2011 and 2016, with the greatest increases occurring between 2015-2016; the presence of these products was concentrated in the U.S. Northeast." Fentanyl can also be found in opioids prescribed for breakthrough cancer pain in opioid-tolerant patients called Transmucosal immediate-release fentanyls (TIRFs.) TIRFS are subject to a US Food and Drug Administration (FDA) Risk Evaluation and Mitigation Strategy (REMS) to prevent inappropriate prescriptions of these extremely potent drugs. A 2020 study by Aventis Pharmaceuticals found that higher doses of naloxone, the opioid overdose-reversing medication, can help resuscitate a victim of an overdose involving synthetic opioids such as carfentanil, a substance that is 100