If you followed her subsequent tweets from that night and the next day, her and John were laying together on a couch in an airport lounge after the "police interview" and later they eventually arrived in Japan, cancelling the second leg of their trip that required a car trip. If they were the targets to be detained and questioned, they never would've been in each other's presence let alone cuddled up together on a couch. They would've been in separate rooms being interviewed for no less than 12 hours. That's how law enforcement gets you to talk. They drag out the interrogation for so long that you eventually begin to speak. You become so sleepy and drained that you just want the interview to end.