End Game

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.

Although it is clear that Rob Miller has connections in law enforcement that help protect him, it makes absolutely no sense that Lt. Benson wouldn't have by now filed a restraining order or other order of protection against Miller. She has repeated corroborated proof of him stalking, intimidating, and harassing her and her son.

If she had obtained a restraining order or order of protection right after he accosted her and her son in the restaurant, she could have him arrested every time he appears and threatens her, which is at least three times in this episode.