Nine states, the Virgin Islands and Washington, D.C., verify that an absentee/mail ballot envelope has been signed but do not conduct signature verification:
Connecticut, Delaware, District of Columbia, Kansas, Maryland, Nebraska, New Mexico, Pennsylvania, Vermont and Wyoming.
Nine states require the signature of a witness in addition to the voter’s signature. These states may conduct signature verification as well:
Alabama (two witnesses or a notary), Alaska (witness or notary), Louisiana, Minnesota (witness or notary), North Carolina (two witnesses or a notary), Rhode Island (two witnesses or a notary), South Carolina, Virginia and Wisconsin.