Long time lurker, first time posting. According to one of the earlier articles Shasta lives a few doors down from her paternal grandmother, in Richmondale, which is south of Chillicothe off of 35. I think she was living with her boyfriend but not sure. A few things to note... there is a large gas station/convenience store on 35 on the edge of Richmondale and a rest area just south of there on 35 where many people go to meet someone. So either she was meeting someone closer to Chillicothe, or she or whoever she was meeting didn't want their meeting observed by anyone in the local vicinity. Another thing to note... we are talking about back roads. Dark, secluded, low traffic roads where you don't open your car door to someone you don't know and trust. Theses roads are traveled mostly by people who live on the road or someone visiting them, or someone wanting to meeting another without being seen.
I don't know Shasta personally but those who do, do not believe she's using drugs again and from the surveillance pic IMO she doesn't look like someone who's using.
Something I find unusual is the fact that LE didn't put out a picture of the car (unless I've missed it). Wouldn't you think they would want it out there hoping someone recognized it and could say where and when they saw it during the hours unaccounted for? Unless they already know.