And also theoretically lowers the efficacy of the security - the bags we carry onto planes go through relatively weak scanners compared to the crazy ones they'v

And also theoretically lowers the efficacy of the security - the bags we carry onto planes go through relatively weak scanners compared to the crazy ones they've got for checked luggage - it's why sending most film through the carry on scanners isn't a problem, while the checked scanners will distort even quite insensitive mediums - it's best to try and get it searched by hand though, if it's important to you.