Agree about the issue with heroin in the this case as its clear TT as an addict and DNV living with him on and off for over 6 years most likely had touched the drug world that surrounded TT either directly or indirectly. My reason for bringing up spice is that its recently been found mixed with other more potent drugs such as fentanyl and this has resulted in sudden deaths. DNV had just had a child so was in recovery mode strength wise, we know she was on antibiotics and pain killers post partum and then what happens if she decides to dabble in a recreational drug that she has used in the past? But, she most likely was drug free during her pregnancy and what if she underestimated her tolerance and got a bad batch of some drug? You mix the alcohol we knew she had had the night of her disappearance (at least 2 drinks per bartender interviewed in the USA School paper article) with drugs and she could have simply OD'd while driving.