If This Were a Saturday Night Live Skit....

The head of the book police would be played by Dan Ackroyd.  From March 11, 2010 ABC News, a report of a man arrested for failing to return a DVD to the library:

Handcuffed and in the back of a police cruiser, Aaron Henson wracked his brain trying to figure out how a simple speeding violation had led to his arrest.

The answer from the Colorado State Patrol stunned him. Henson never returned the DVD he'd checked out of the Littleton library, and there was a warrant out for his arrest.

It turns out that a $31 DVD that Henson had rented in 2004, he had handed off to a friend, and forgot about.  He claims never to have received mailed notices about it, since they were to an old address.  Henson was out $460 for the arrest, impound of his car, etc., but the city decided to be nice and refund those costs--and they are looking at revising their policy on this.