I actually took an 10 inch screwdriver on to a flight accidently. When I was unpacking at the hotel I was like "how the F did this get past the security check?"

Another time I was running late for my flight and forgot to empty my 16oz water bottle. After my bag went through the scanner I realized my mistake and told the TSA agent about it. He uncapped the bottle, swirrled the water around, sniffed it, and then handed me back 16 ounces of water and said not to worry about it.

So yeah, I have minimal expectation TSA will catch this.

Now UK airport security might handle it. I've been specifically asked if my laptop has been damaged, is swelling or has been recently repaired. I assume if you answer yes to any of those questions your device is banned from flying.