I have to say that I think the security measures are largely a joke. And the differences country to country are simply crazy, and there is no consistency.
In Amsterdam they made me wait for special screening when I was just changing planes headed to Berlin. When I asked them why they said it was because of how many electronics I had (I had my work laptop, my work cell, my personal cell and personal tablet). With me was an old lady maybe 80 who they were pushing in a wheelchair who had 3 electronic items so they were special searching her too.
Leaving Germany on one of my trips I set off the metals due to the hardware in my neck and back from my cancer surgery. This happens about 3 out of 5 times I go through security screening pretty much anywhere. They took me into a screening room and made me take off my shirt to prove I wasn't carrying anything and even still had a conversation about the probability of a 40-something fat white American possibly surgically sealing some dangerous weapon between my shoulder blades before letting me go. On another trip through the exact same airport I set off the metals, they touched my back, asked me about it and when I said surgery they said "ok" and just let me go.
The US has far tighter regs than other countries that I have been to, and are way more inconsistent and often ridiculous. In Germany and England they had no problem letting me take my water bottle through with me, and it had close to a liter of liquid in it. In Chicago I had a small bottle that I had purchased in the airport with about half of the water remaining in it which I was drinking from and they got mad at me that I took it all the way to security before disposing of it. I said hang on, guzzled it, then wanted to put the empty in my bag. It freaked them out and they had a 5 minute discussion which involved a supervisor when the guy asked me to step out of line and grilled me like I had just swallowed 10 pounds of highly dangerous explosives, and right in front of them, can you believe the temerity?!? Gasp, shock, awe!!!
Seriously, what the ****? They are so damn clueless what it takes to make anything actually safe, it feels like a circus almost every time I go through. And the gaping holes in the supposed security systems make me feel not at all safe in the end anyway. What a joke.