The statute of limitations is the time that the State has to file formal charges, not the time that they have to arrest. Here is the list of statute of limitations in Louisiana. It goes by level of offense. If these are felony offenses than they have at least 4 years to file charges.
http://www.legis.state.la.us/lss/lss.asp?doc=112622
The State could wait years and file just before the limitations period runs, but reasonably speaking if it's been a year without you hearing anything than someone's dropped the ball. Your paperwork could have fallen in a crack and that would only be to your advantage. Its also possible that the prosecutor declined to file any charges. If that happened than you should have gotten something in the mail, but we all know what happens to mail sometimes. You could contact the DA's office to inquire about the charges, but you might wake the sleeping giant. Just make sure that there isn't a warrant out for you.
FlyingRon, the speedy trial statute you are referring to doesn't work like that. Those limitations are on the time the State can take to file charges while the individual is being held in custody. If you don't file in time than the defendant just has to be released or granted bail. Such a speedy trial violation doesn't have any immediate implications on the charges themselves, and they can be proceeded on even if the state waits years to file, right up until the day before the statute of limitations runs.
http://www.legis.state.la.us/lss/lss.asp?doc=112708
(There are other speedy trial issues guaranteed under the US Constitution that can get a case thrown out after charges are brought, but that requires a great deal of time passing and a lack of diligence on the part of the State...that's another issue.)