Carry-on Baggage Screening in Standard Lanes TSA screens approximately 3.3 million carry-on bags for explosives and other dangerous items daily. Here's what to expect when taking your carry-on bag through security screening next time you fly.

TSA officers may flag a carry-on bag for a physical inspection for a variety of reasons, most of which involve the X-ray operator spotting an "anomaly" or an item that cannot be clearly identified. Common culprits include densely packed electronics, tangled cables, or organic materials (like large blocks of cheese or powders) that can resemble explosives on the scanner. Liquid violations—carrying containers larger than 3.4 ounces—are the most frequent reason for a bag search. Additionally, "cluttering" can trigger a check; if items are stacked too tightly, the X-ray cannot penetrate the layers, forcing an officer to manually verify the contents. Sharp objects, tools longer than seven inches, or even harmless items like high-end camera lenses can sometimes look suspicious under specialized imaging, necessitating a hands-on look to ensure passenger safety.