I agree that signature verification may be prone to errors.
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
I am for verifying absentee ballots by requiring the absentee voter to write their drivers license (or state ID) number on the inner envelope. There would be no confusion about a signature, which can vary naturally. Primarily, there could only be one vote per DL/State ID number.