Check your parish(es) of interest database pages and see for yourself. Statewide trunked system report is here, just sort by "type" and scroll through DMR
Most DMR in Louisiana, that I have encountered is used in business applications. There is only one parish that I know of that is pure DMR and that is DeSoto Parish. Just about all public safety is on LWIN.
The Digital Frequency Search page can give you a list of entities that are licensed for DMR. Note that this is only is licensed to use DMR. It does not tell you who may actually be using it, only that they are licensed to do so.