>>2817059
They don't care as long as you can proof it's a laptop that functions like a laptop is the main take away.
The port doesn't matter because all airports, train stations, seaports, an agent can stop you and ask you to prove your electronics are real.
The searches are performed at the whim of whatever side of the bed the agent woke up on that morning. Though if you look like a nervous neddy you're probably more likely to grab someones attention.
You will most likely never experience an electronics search unless you fly regularly and increase your odds to get it.
If they searched everyone's electronics, no airport could function because it takes too long.
The original post you replied to explained it perfectly; they are looking for how you act in regard to your electronics being looked at. From there they assess your responses and often can tell if you're a drug mule or not.
Warrants aren't needed because you condoned/agreed to be searched when booking your ticket and voluntarily walked into the airport security. Airport security also operates slightly different as "private security" first then they turn things over to law enforcement. It's a good way to cut through the "unlawful searches" thing most countries have, a private security guard did it first not the police.
The whole "UK citizen arrested for anime porn" is put on display around news agencies recently is because it's the most effective tactic for deterring would be morons from getting on the plane with contraband. It's simple and easy to get the would be smugglers a jolt in their pants to remind them that the security checks are actually doing their jobs. You have better odds winning the lottery than thinking the below average pay security guard will give a rats ass about anime torrents, video games you "borrowed", or movies you "got from a friend". They are looking for things that could bring down the plane, drugs, gold, plant seeds, and so on. They don't care about your stupid cartoons.