I went with my better half to Paris for a long weekend (just got back, having butchered my inbox). We flew from Heathrow to Charles-De-Gaulle; normally the Eurostar would have been a preferable choice, but it was too expensive this time. We travelled light, not wanting to lug around suitcases so I checked my tripod in its bag, along with my penknife and other sharp bits. Anyone who's been on a flight in the last few years will know about the liquid laws - no liquids in your hand baggage unless they're in <100ml bottles and will fit into a little plastic bag that you put through the scanners separately. Turns out this isn't quite as effective as you might think.
After getting through security without a hitch, my girlfriend discovered that she'd managed to leave a bottle of hand wash, the alcohol stuff, in her rucksack - which security hadn't noticed. Given that last year I was stopped en route to Germany because I had fountain pen cartridges in my pencil case, this was a bit surprising. On the way back, I found that I'd managed to leave a tube of toothpaste in my rucksack going through French security. Again, nobody commented. On the plus side, I discovered that my rucksack's inner pockets are totally waterproof after it burst.
Thankfully we're not terrorists and you might well, and rightly, say that some hand wash and toothpaste aren't going to bring down a plane so why worry?
The problem is there is a lot of pomp and high-horsing when it comes to airport security and it's a bit disconcerting that these sort of things are missed. I personally think it's an annoying system to have to throw away your coke bottle before you board only to buy another more expensive one in 'Duty Free', but I grudgingly accept it on the basis that now terrorists can't smuggle along their explosive liquids. All well and good, but only if the security staff are actually on the ball. If they're not going to check 100% - this stuff *does* show up on the scanners, I've been caught out previously - then why check at all?