Just something to keep in mind. LE does not always release all of the info they have. We don't know what all was found in the car, other than a mention of blood. No details on how much, if it was fresh or old, etc...
An example of LE holding back is this case I ran across last month.
Bonnie Santiago.
LE knew there was blood in Bonnie's vehicle, footprints on the inside of the windshield, and the rear view mirror was almost ripped off. They knew there was likely foul play, yet still maintained it was a missing persons case. The info about the vehicle only came out a year and a half later in a search warrant.
We don't know and may never know what all LE has as evidence in Cheryl's case unless they charge someone and it goes to trial.
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