I'll look up the source again, but I know that an earlier article I read said that one of the men who was with Savannah lives with his parents at the house from which the car was towed.
If Savannah did overdose on drugs, Kentucky has had a Good Samaritan law since the spring of 2015. Briefly, "The Good Samaritan Law was meant to give a pass to people who witness an overdose. They can get help for the victim without facing any punishment for possession of a small amount of drugs or paraphernalia."
Unfortunately, LE says that most people don't know the law exists or they think it is a trap. The Good Samaritan laws are saving lives in some places though. Van Ingram, director of Kentucky's Office of Drug Control Policy said, "If you look at Cincinnati, that has a similar law, and had 123 overdoses in a very short period of time, only three of which were fatal, people are calling."
WKYT Investigates: The problems with Kentucky's Good Samaritan Law
ETA: "Police on the hunt for a missing Kentucky mom have interrogated two men who left a bar with her the night she vanished and executed a search warrant
on the home of one of the men, where a car was towed away by authorities.
Cops Question Two Men Last Seen With Missing Kentucky Mom Savannah Spurlock