I am currently in training with a CDL company (Just got my CDL license in April) and this company does not allow firearms in the truck. The main reason is the State reciprocity (we travel nationwide). However, knives and blunt objects are ok. My trainer went over all of this with me (my first week I drove from Denver to Detroit, from Detroit to Houston, from Houston back to Denver - over 3k miles). He told me that out of the 42 years he has been driving trucks, he was mugged once - and it was in Houston. All the thieves got was $2.34 (he doesn't carry cash). He has been carrying knives ever since. So, this got me thinking - he was grabbed from behind and couldn't move his arms. I want a pair of boots (yes, like the ones in the Dark Knight) that has a spring loaded blade that protrudes from the toe, as well as the heel. If I am pinned from behind, a blade that comes out from the heel can easily find its way into the perpetrators shin. Where can I find such a contraption? Does any manufacturer make them?