Answer:
Mars is in the backseat of the police car because he set off the alarm at Jonas' house while looking for Jonas and Aurora.
Step-by-step explanation:
This is from a podcast titled "The Unexplainable Disappearance of Mars Patel".
It is about an eleven years old boy named Mars Patel who together with his friends Caddie, Toothpick and JP embarked on a quest in search of their two friends who were missing. Mars was very concerned about the disappearance of his friends but no one listened to him.
Episode 2 begins with Mars being in the backseat of a police car because he went into Jonas' house without permission, looking for Jonas and Aurora and set off the intruder alarm.