I had my bag searched at the airport because tweezers showed up when they x rayed it.
After much ado I was allowed to keep them. I also had 2 bottles of spirits in a carrier bag that I had bought with my husband in the duty free shop in which they showed no interest.
I have no idea what harm I could do with the tweezers but if I had smashed the two bottles together and I would have a couple of lethal weapons!