China White is a dangerous and deadly cocktail of opioids, it is a mixture of diacetylmorphine (heroin) and the potent synthetic opioid a-Methylfentanyl (a less potent, longer acting derivative of fentanyl); sometimes the base compound of fentanyl is used instead but a-methylfentanyl is preferred because it isn't as potent and has a longer duration of action (1-2 hours versus 20 minutes for fentanyl). Diacetylmorphine is about five times the potency of morphine whereas a-Methylfentanyl is about 80 times the potency of morphine. The main reason heroin is cut with fentanyl analogs like a-Methylfentanyl is to give long term users who have developed a tolerance to opioids the ability to get a high; but it is often sold to people who have little to no tolerance to opioids and in those cases if often fatal. There have been several notable deaths from heroin/fentanyl cocktails in recent years, the most notable probably being actor Philip Seymour Hoffman who died of a massive overdose of heroin and fentanyl in 2014.
One of the young girls involved in the case is named Brooke Davis. Brooke Davis is the name of a popular character on the teen drama One Tree Hill (2003) who was portrayed by actress Sophia Bush. Bush was a main character on another Dick Wolf show Chicago P.D. (2014) and guest starred a number of times on SVU as Detective Erin Lindsay.