Rules Update - Truth Detection Abilities & Defenses against them

The following rules changes have been made:

A new Trait has been added:
Interrogate: Abilities with this trait determine if the target is telling the truth or not.

This trait is added to the following abilities:
Interrogate (Skill), Extract Truth (Skill), Torture (Skill), Torment (Skill), Dread Surgery (Skill), Confession (Prayer), and Truth Ear (Ability).

Willpower (Periodic)
Defense
This defense skill allows a character to resist a mental attack or mind-influencing ability. In addition, the character is immune to that attack or ability for thirty minutes. When used to defend against an ability with the Interrogation trait, it allows the character to lie, and the person using the detection ability believes that their skill or effect has worked properly.

The skills Torture, Torment, and Dread Surgery have the following lines added to them ("Extract Truth" specifically does not gain this line, this is intentional):
"Use of the skill Willpower as a defense does not allow the recipient to lie to the torturer, only to resist having to answer the questions."

This has been updated in the Online Rulebook.

As a question along these lines, should the prayer "Detect Truth" also have this trait?  Or is it different from the others in some way?

Yes, it should - thank you for the catch.

How does this integrate with the changes:

Confession
4 FP; Traits: Divine (Law), Attack, Interrogation
This prayer compels the subject to speak the truth in response to the next question that the caster asks her. The subject can choose not to answer the question, but if she responds she must give a completely true and accurate answer. If the subject does not answer the question, the prayer binds her to the preceding described conditions for a duration of one hour with respect to the specific question and the caster.

It integrates just like the wording for Confession and Willpower says it does.

If they take the Confession, and answer, they must do so truthfully, per the Confession rules.

If they take the Confession, and choose not to answer, they are bound, per the Confession rules.

If they use a Willpower, they may lie, and the person casting the Confession believes it to be true, per the Willpower rules.