In Georgia, possession of less than one ounce of marijuana is treated as a misdemeanor. If he is charged with misdemeanor possession of marijuana, he will be subject to imprisonment of 12 months in jail and a $1,000 fine. You can visit the site http://www.ms-firm.com/marijuana_possession_georgia.html to get more details.
I dont think marijuana's a felony at all, especially if its not even an ounce. I'm just going off of what I've seen on Cops lol, so do t quote me. But most likely he'll have to pay a fine or go on probation or something like that.