How to make weps not pick up on walk

Well im looking for help or a snippet of code to make my weapons only be able to be picked up on USE not when you walk over them any help guys?

Pick your already answered thread :
http://www.facepunch.com/showthread.php?t=831295
http://www.facepunch.com/showthread.php?t=618055
http://www.facepunch.com/showthread.php?t=512769
http://www.facepunch.com/showthread.php?t=89679
http://www.facepunch.com/showthread.php?t=345165
http://www.facepunch.com/showthread.php?t=796615
http://www.facepunch.com/showthread.php?t=776484
http://www.facepunch.com/showthread.php?t=733683
http://www.facepunch.com/showthread.php?t=719001

And that’s just from the first page of results, next time please search before making a new thread.
http://www.facepunch.com/search.php

And what do i do with that code? put in note pad?