I just recently moved to Atlanta from Virginia, and I find the law here ambiguous as well. In Virginia you can carry a 4" folder no problem, and I've carried a knife of about that size for my entire adult life- except while flying.:grumpy:
I've heard various reports about what is and is not cool to carry here, from "anything over 2" will land you in the clink" to "3" is okay" to "as long as you have the clip showing you're okay". I think the opinion of the officer above is shared by many police. I've spoken personally to 2 officers in DC (while carrying a 4" blade where only 3" is supposed to be legal) and they both said basically the same thing: "As long as it's not a switchblade and you don't stab anybody, drive drunk, or deal drugs, I couldn't care less about a knife"
I've read the laws and find them very ambigous. (I don't have them in front of me to quote them here) This may be intentional, to allow a LEO a degree of discretion in dealing with those who are in a gray area (ie: those who are being jerks and are making his job difficult). My experiences with police have always been very positive. To date I have never run into a cop who has "been out to get me" and I would like to think that as long as I didn't give a cop any attitude, the blade length of the knife in my pocket would never become a topic of conversation. It never has before and I've been carrying a knife every day for over 15 years.
Of course I've heard stories of people being harassed and hassled by the police, but I notice that (at least from those I know) that the people being "hassled" are the same people who have chips on their shoulders, bad attitudes towards police and big mouths in general. This may be a naive opinion but I have never had any personal experience that would cause me to believe otherwise.
In light of this, I carry what I want to and don't worry about it. I figure that since I'm never doing anything illegal or drawing attention towards myself I should be okay. If I end up talking to a cop and he asks me what I'm carrying , I'll ask him politely why he asks. If he responds "because I noticed the clip in your pocket", then I will respectfully reply "that's because I carry my pocketknife openly. If I wanted to conceal it I would have it inside my waistband with my shirt over it." As far as I can tell, open carry is legal in Georgia.
If I end up getting busted I'll go to court and be pleasant there as well. (It's amazing to go to traffic court and watch morons lipping off to the judge! While they're "keeping it real" and getting the maximum penalty, I'm the polite guy with a smile that's having the charges dropped) If it turns out that I'm on the wrong side of the law, then I'll deal with that. But the possibility of this ever happening is not great enough to keep me from carrying what I want to. This is still a free country.