Theere are different statutes of limitations for different types of crimes.  I am not sure the type of crime that your bfriend has a detainer for.  If the charges are pending, the the statute of limitations is no longer applicable and can be brought in to face those charges.  I suggest hiring a lawyer in GA to look into the matter so it does not one day become an issue or pop up inconveniently.  Also, cases do not get dimissed on their own unless a judge does that.  If the state's atty decides not to prosecute the case b/c they cannot find your bfriend, that does not mean he cannot later be arrested.