Airport - customs intimidation techniques

It can be a $hit show in customs. The people on the same search table as me kept being questioned about a ziplock bag of cheap costume jewelry, they were very angry but finally got released. They briefly questioned me, I was polite and was released in about 1 minute. The time before they went through everything, suitcase’s were a complete mess after they were done. It’s been a huge pain lately but having your receipts, being calm and respectful appears to be working for me. My local friend spoke to someone that works at the airport about our issues with customs, he was told that ZIH and another small airport has customs being ran by this new company. I certainly would no longer be bringing anything to donate for sure.