On the CZ when we arrived in Omaha, we stopped just outside the station, conductor said we were waiting for the platform to be ready for us. After a couple minutes, we arrived with several Omaha police officers waiting for the train, they boarded our car and immediately went upstairs, I was in the lower level coach seats. Then they returned with a female in handcuffs. When she was taken off, then other passengers were allowed to de-train from our car. I don't smoke, but went out to see what the scuttle butt was. Apparently she was smoking crack in the rest room and when she got back to her seat upstairs, her crack pipe fell out of her pocket and the passenger behind her found it and gave it to the conductor. A policeman came back on and entered all the bathrooms across from our seats and then put up tape, closing one of them.