It would appear to me that an attorney does not need certification to perform title searches. 

"(c)  Nothing in this Section prohibits any attorney duly licensed and authorized to practice law in Louisiana from personally reviewing and examining the public records in order to certify or give an opinion as to the title to immovable property."  Taken from:  http://www.legis.state.la.us/lss/lss.asp?doc=507107

Google is truly your friend.

Best wishes,

Donna