Snapchat Law Enforcement Question

Tonight, I observed my daughter using Snapchat and asked her to show me around. If you're not in "ghost mode," it appears that anybody can see your images, and it even displays a large circle on the map to represent your position. I immediately began to consider the issue of Abby and Libby. I'm interested whether the FBI has access to the number of people who have seen their Snapchat story. Due to the lack of proof for a warrant to expose the Guide ' info, this connection makes me wonder if the investigators would have access to only the girls Snapchat and not anybody else who watched it. Law Enforcement on Snapchat Is it conceivable that a stranger found these ladies on Snapchat map and thought he had plenty of time because of how far down the trail they were? Please accept my apologies if this has previously been addressed. Every year, my heart breaks for them. Thanks