Yep, always test your ahem .. letter openers first before opening lettersI have one that was described by the maker as G10 and it has not been detected with handheld or walk through detectors. Best way to find out is a "trial run" when you don't really care about being denied entry if it sets off a detector. Obviously, I am referring to a trial run in a location where you are committing a policy violation and not a criminal violation.