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.RC is quite vocal, as well as DVs friend from New Mexico, just not to the media. My guess is LE told them not to talk to the public about the case, which is typical. It is also not surprising MK has said nothing, as she is peripheral. DV does have people championing for her - its TT and JDT, people just don't like that.
I feel like DV would know the difference. K2 is typically purchased by kids or others who have no access to the real thing. DV definitely has access to the real thing. I would be more worried about heroin in this case IMO, simply because of the verified link between heroin and DV via TT's criminal record.
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.