While I was on vacation in Tennessee last summer with my girlfriend I found a Gerber knife left behind outside a bathroom. It was a nice knife, one of the folding ones, so I grabbed it. There were no cars and no other people (hadn't been for a long time) so I figured they weren't going to pick it up. Wording that way it was the wrong thing to do, but it was last June so now's a little late for that. My question is, before I go about using it do I have to worry about diseases? My girlfriend had to take a course in infectious diseases for her cosmetology classes and she's told me that HIV will die when the blood dries and that hepatitis will live for two weeks. It's been almost a year. I'm still nervous about carrying it though and curious if there's anywhere I can find out about this. Also, I don't know if it would be an option to clean it in something like an autoclave machine since they use that for piercing needles and tattoo guns to kill off infectious diseases. Any help or links would be great.