The Trouble is Not in Your Set - S6-E14
Continuity mistake: Christine walks in after brushing her hair. Her hair changes throughout the scene.
Continuity mistake: While in the courtroom Bull walks up to Christine, Dan, and Harry. The shot changes and he walks up to them again.
Continuity mistake: After the first courtroom scene people are walking out. The right door is open and the left closed. The shot changes and now the right is closed and the left is open.
From Snoop to Nuts (1) - S6-E18
Continuity mistake: When Roz and Christine are talking in the cafeteria there is a coffee mug in front of Roz. The shot changes and she is holding it.
From Snoop to Nuts (2) - S6-E19
Continuity mistake: When Roz and Mac are in the cafeteria, Roz puts her coffee cup on the table but still has her hand on it. The shot changes and her hand is no longer on it.
Continuity mistake: When Bull shows Harry the bag of cockroaches, Harry has his gavel in his hands. When Bull walks away he suddenly has a pen in his hands.
Yet Another Day in the Life - S6-E22
Continuity mistake: When Mac calls the Becker case, Harry is holding a pencil. The shot changes and he is no longer holding the pencil.
Yet Another Day in the Life - S6-E22
Continuity mistake: During the case with the Star Trek fans, in one shot the gavel in front of Harry disappears.
Answer: Being declared legally dead is called "death in absentia", meaning there is no evidence of death (i.e. a body), but the individual is presumed dead. This can happen to anyone, not just MIA soldiers. If a spouse petitions the courts to grant a divorce on the presumption of death and all criteria are meet, they are legally divorced and free to remarry. The return of the presumed dead would not change the divorce ruling. However, if a spouse does not go through the legal steps prior to remarrying, then the return of the presumed dead spouse would nullify and void the 2nd marriage immediately (and the remarried spouse could face bigamy charges).
Bishop73