One Huge Plot Hole!
The scene at the gas station is the biggest plot hole! Paul planted the gun in Jenna's hand to make it look like she killed Dean. No way could this be possible with the position of the bodies and the physical beating that Jenna took! Evidence would show that Dean was shot at close range and Jenna's was far away, ballistics and other evidence would prove this.
If that is the case then Paul would be brought into the investigation since he was the only other person involved with this abduction and his DNA might be found on Jenna or for that matter on Dean to connect him with this crime.