Sealing bags before check-in

I like that many foreign airports require passengers to send all of their bags, including checked bags, through x-ray machines to even enter the terminal. Then, to ensure that contents aren't changed, security officials seal the cleared bags with zip ties with flags that are stamped to indicate which security station scanned the bags.

With steep penalties for carrying illegal substances, I get nervous about people adding contents to my bags after I've checked in. Before the introduction of TSA compliant locks, I used to lock my bags. But, now that are master keys, it'd be hard to detect whether bags have been tampered with. While it's still possible to cut through zip ties, it'd be harder to justify, since the bag had already been scanned, and harder to restore since the perpetrator would need the right stamp from security.