Where can I find out if there was a tornado in Rustin Louisiana?

I think you mean Ruston. For recent events you might want to check out the homepage of the National Weather Service in Shreveport, LA and the SPC storm reports where you can enter a specific date. Please note that the SPC storm reports are preliminary and don't always correlate to actual tornadoes.

For historic tornadoes 1950-2011 you can see the Tornado History Project. For Ruston, you can specify a search for Lincoln Parish (enter under county), Louisiana. Note that the paths of tornadoes, on the maps, especially older ones, should be taken with a grain of salt. While the paths depicted are usually represented as straight lines, many of these tornadoes actually follow curved or meandering paths.