Two sisters who claim that State Farm defrauded the government in the wake of Hurricane Katrina will be allowed to testify in their lawsuit against the insurer, a federal judge has ruled. In an order issued Monday, U.S. District Judge L.T. Senter Jr. ruled that Cori and Kerri Rigsby’s work as insurance adjusters gave them relevant knowledge of the allegations at hand and that the two should be permitted to testify. The sisters allege that State Farm wrongly denied claims arising from Katrina, shifting costs onto the National Flood Insurance Program.