Ask for a copy of their federal tax returns...see if they applied and received a PFD.  While you cannot eliminate fraud, you can make it so difficult because you are not the only one looking for the fraud.  Claim Alaska as your residency on Federal Taxes and see how your real home state likes it.  2 strikes.  Apply for a PFD when you live out of state, 3 strikes.  Register to vote in Alaska but live in Texas, strike 4.....make it very difficult to be a "resident".